Far Cry 2

This game is fairly polarizing, and I don't blame anyone who completely disagrees with me on this. I loved this game because it is beautiful to look at, and the story mode is very thought-provoking. The main character is essentially a mercenary who's been hired to help take out a war-profiteering arms dealer who's been supplying both sides of a civil conflict in eastern Africa. In gameplay, weapons degrade over time, the weather can be unpredictable, and players can get killed for doing absolutely nothing at all.
Sometimes the missions can feel quite repetitive, and many people don't like the mechanism by which one looks at the map is a bit awkward. Vehicles often must be repaired before they are drivable, and anti-malaria medicine must be taken in real time in order to stave off blurred vision and eventual death. In story mode, the player eventually has "buddies" who are NPCs that can assist during difficult missions or often simply provide moral support. It might sound ridiculous, but I had to euthanize my buddy during a mission at one point by shooting him, because I had to keep the syrettes, which are used to heal, but can also be used to overdose a fatally wounded buddy for an easy death.
This experience hit me harder than it should have, but it was also at this moment that I realized I loved Far Cry 2, in spite of some of the tedious and tense missions. It provides a higher degree of realism than a lot of games out here, because let's face it: being a hired gun trying to take out a warlord in a third world country would probably involved just as much tedium as it would danger. Far Cry 2 isn't for everyone, but you'll know almost immediately if it's for you.

Half Life 2

Gordon Freeman wakes from stasis to find that a lot has changed since he defeated Nihilanth and was subsequently plucked from Black Mesa by the G-Man. As Freeman comes to, he comes to know that the Earth has been taken over by a hostile alien civilization known as the Combine. He must pass through various Combine-operated security checkpoints to get to wherever he is going. However, before he can figure this out, he is detained by a security officer and taken to an interrogation room. The officer then reveals himself to be a former co-worker, and introduces Freeman to Alyx Vance once in the relative safety of Dr. Isaac Kleiner's Lab, where they've contracted a rudimentary teleporter to send themselves to the anti-Combine base resistance base known as Black Mesa East. Unfortunately, Dr. Kleiner has a pet headcrab named Lamarr, who interrupts the teleportation process, causing Freeman to teleport to a few open locations before landing just outside the lab. This alerts the Combine to his presence, and he must fight his way to Black Mesa East, not knowing what awaits him there.
Fans of the original Half Life seem to have taken to the sequel just as easily, but it has also attracted new attention from gamers. Additionally, HL2 was released as part of the Orange Box in October of 2007, which also featured 2 additional HL2 episodes, Team Fortress 2, and surprise favorite Portal, which was so successful in its own right that a sequel is now due in spring of 2011.  

Team Fortress 2

This game is another first person shooter, but can be a nice break from the seriousness of other titles on this list. Two teams representing rival corporations, Reliable Excavation & Demolition (RED) and Builders League United (BLU) compete against one another for various objective determined by the mode of gameplay. Some maps involve arena/team deathwatch mode, where players do not respawn after they've been killed, but others are focused on objective similar to "capture the flag", where both each team is trying to steal information from the other team's base, or are attempting to capture and defend a specific point on the map. All the while, teams are berated by the voice of an unnamed woman who is clearly in charge of something, but exactly what it never made completely clear. She is voiced by none other than Ellen McClain, who Valve fans will recognize as GLaDOS.
Play as one of 9 character classes, each with unique weapons that encompass at least one ranged and one melee each. This game can be good for killing a whole evening, but is also fun for a few casual matches. Its comic style provides a welcome contrast to the gritty realism depicted in many other shooters.

Doom 3

What can be said about the Doom series that hasn't already been said? These games are immensely satisfying, and it's hard to pick just one. However, there's so much disparity between each game, particularly between 3 and the first two, that they really have to be looked at as separate entities in this case. Doom 3 does uphold the tradition of having Earth threatened by the minions of Hell, but this time, teleportation experiments conducted by a military-fortified corporation on Mars have accidentally opened a gateway, releasing demons who are intent on heading towards Earth.
Even though the thought of demons and the walking dead taking over a military base on Mars and piloting stolen spacecraft to earth sounds moderately hilarious ("Hey, Beelzebub, can you drive a manual transmission?"), the game unfolds at such a pace that there isn't much time to contemplate the realities, as one of the humans associated with a visiting team is revealed to be cooperating with Hell to facilitate the invasion. Loading with exploding guts and blood splatters, gameplay is about what one would expect for a Doom game. Gory, satisfying, and not without a touch of black humor.

Death Spank

This title, released by Hothead for PC in October of 2010, is potentially going to be the most controversial on my list, due to the fact that this game was not particularly high profile, and a lot of folks dismissed it due to the cartoonish graphics, and that it includes clear elements of an RPG. However, both the original Deathspank and the sequel, Thongs of Virtue have been some of my favorite games this year, and I would argue that at best, the mode of gameplay, which is similar to Diablo, is and RPG-action hybrid. It certainly helps that the dialogue is full of cheeky smartarsery, and the world in which Deathspank exists is so absurd that after a while, players don't bat an eye when given quests which involve collecting unicorn feces or buying felt from a traveling salesman. While the original is more heavily dependent on melee weapons and features a more RPG-oriented aesthetic (unicorns, right?) the second game takes place during a war which references WWI and features more ranged weapons and a few science fiction elements, as well.

Left 4 Dead

Ah, the Zombie Apocalypse. A topic near and dear to my heart, and I know I am far from alone in that capacity. There is an obnoxious quantity of zombie-related games, but both of the Left 4 Dead games are particularly intriguing in that the co-op mode doesn't just involve playing together, or helping each other out. In certain instances, a player actually needs his or her co-players, like when the player respawns in a locked closet, or needs healing but is not carrying any form of medicine. Teammates can bring one another back from the brink of death with a defibrillator or lure the infected away from other teammates with a pipebomb.
If one takes it as a foregone conclusion that the goal of a first person shooter is to simulate a situation for a player to experience, then the L4D and L4D2 are the clear leaders in the zombie category, due to the fact that players must help each other through verbal communication, strategize together, and depend upon one another, which is more challenging than it sounds. There are certainly a lot of people that hate these games for this exact reason, and while this is totally a matter of personal preference, one has to wonder how long these folks might last in a real zombie apocalypse. Not that those of us who are lucky enough to have the luxury of being gamers are probably going to be leading the Zombie Resistance when the apocalypse goes critical anyway.
Enjoy tasting delicious, fellow numb-butts!

Call of Duty: Modern Warefare

Another first person shooter, this title is the fourth installment in the Call of Duty series, but the first to deviate from the WWII setting of the previous games. Set in 2011, Modern Warfare follows the story of civil war in Russia after the execution of a Middle Eastern leader by a radical faction. Fighting takes place in multiple locations throughout the world, including Pripyat, Ukraine, a now-abandoned city right next door to the scene of the notorious Chernobyl disaster.
With access to modern weaponry such as rocket propelled grenades and C-4 explosive, gameplay is a natural continuation of previous titles with regard to movement, damage, and AI teammates. Both the single-player campaign and multi-player modes received critical acclaim, though the game took some flak for not revolutionizing the concept of the first person shooter. Personally, if that's the biggest issue, I'm content to play anyhow. The graphics and general realism of the environments more than make up for any perceived lack of innovation with regard to gameplay. Bonus Fun Fact: The ending credits feature a rap performed by Mark Grigsby, who happens to be Modern Warfare's lead animator.

Duke Nukem 3D

The Duke Nukem titles, a series of first person shooters featuring the snarky, alien-infested adventures of one Duke Nukem, are so popular that when a new generation title was announced, Duke Nukem Forever,  gamers the world over rejoiced. Then the title was postponed again and again, and was eventually thought to be dead in the water for good. That is, until the morning of September 3, 2010, when we walked into the PAX Prime Expo hall only to discover that Duke Nukem Forever was alive and well at Gearbox, with a playable demo, pee jokes included. Still no official release date, but in the mean time there is Duke Nukem 3D to tide us over.
Even though this title is nearly 15 years old, it is still so popular that people have ported it to OS X, several Linux distress, and modern versions of Windows. There are over 2000 fan-made levels that have been included in official spin-offs and add-ons and even an early demo, LameDuke, that was released in 1997 as a bonus version.
Sure, the graphics are terrible by today's standards, and maybe the action is a little choppy, but on the other hand, not every game is awesome enough to have its theme song covered by Megadeth. If it's good enough for Dave Mustaine, it's good enough for me.

Assassin's Creed

Some days you start out as a barman and end up confined in a top secret lab, owned by the Abstergo Corporation, which happens to be run by Templars, who apparently still exist in 2012. Desmond, the barman in question was once a member of a modern day faction of the Assassin's Brotherhood, a group that was historically at odds with the Templars. He also happens to be a descendant of one of the members of the original Brotherhood, Altair ibn La-Ahad, and using a device known as the Animus, Desmond must try to access his "genetic memories" in order to recover artifacts known as the "Pieces of Eden", which are rumored to give the possessor the power of mind-control. Naturally, the Templars want to use this power in conjunction with an orbiting satellite to enslave the entire planet. Like you do.
Health within the game is dependent upon how accurately Desmond's memories match those of his ancestor, with damage being depicted as degrees of deviation from from the actual memory. When health is at 100%, the "eagle vision" feature becomes available, which highlights all visible characters in a given scene as either red or blue, depending on whether they are friends or foes. Utilizing elements of stealth, historical fantasy, and science fiction subgenres, Assassin's Creed is a groundbreaking series that has informed a lot of subsequent titles. 

Gears of War

Although at its core a hardcore game, Gears of War is surprisingly accessible to those not really familiar with games and is absolutely stunning fun played cooperatively or online with a mate on a big screen television. Yes the game came out on the 360 at the back end of 2006, but it's still one of the best looking games out, and has only really been surpassed by... the PC version of the same game - and Crysis if your PC can run it. If you haven't got it, get it, not for the hammy sci-fi storyline, not for its muscle bound meat head characters, and not for the brutal chainsaw/assault rifle either, get it because it's simply great fun. Action gaming at its very best.

Resident Evil 4

Capcom chucked the Resident Evil design handbook into the shredder for the fourth instalment of the massively successful survival horror series, and the decision was an inspired one. With the camera now over your shoulder rather than fixed, Resident Evil dragged itself into the modern video gaming age without losing any of its intense survival edge. Set in a dusty Spanish village, it was crazed evil villagers rather than out and out zombies who were hell bent on eating out your heart. The Wii edition with special controls is probably the best - stay clear of the PC version though.

God of War 2

If you like your gore-filled, in-your-face action and a splattering of killer combos look no further than the God of War series. Despite being on the PS2, the game's graphics are amazing, and you won't be let down in the gameplay stakes either. So good is God of War 2 that it made it into our Top 10 games of 2007 across all platforms. In his gushing review, Tom said God of War 2 "is one of the most epic, dramatic and action packed games you'll play this year". We'll extend that description to apply throughout 2008 too. If you have a PS2 or a backwards compatible PS3 and haven't already taken Greek warrior Kratos out for some deadly chain action, you owe it to yourself to do it right now.

Ratchet and Clank: Tools of Destruction

Apart from Uncharted: Drake's Fortune, Ratchet and Clank: Tools of Destruction is probably the best reason to own a PS3 right now. There's nothing here not to like: Pixar-quality graphics, insane weapons and wicked humour all combine to provide one of the best "next-gen" experiences out there. Another one to show off your new HD TV, Tools of Destruction is not a platformer. It's a third-person shooter with jumping. And you'll be jumping too. A game all PS3 owners, let alone action fans, should not be without.

Tom Clancy's Ghost Recon Advanced Warfighter 2

The original GRAW was great, but the sequel is even better. Despite a rather short main campaign, the near future squad-based shooter has tonnes of replayability mainly because of the excellent multiplayer, which is still extremely popular online. "Put simply, if you like military-themed third-person online shooters there should be something for you to love in GRAW 2", said Tom in his review. Four players can even play on a single console, either offline or against other players over Xbox Live. Swe

Crackdown

Crackdown is like finding a tenner buried deep within the sweaty pit that is your couch - a wonderful surprise. Who knew that a game that came bundled with a Halo 3 beta key would be so much fun? And yet it is. And not only is it fun, it's completely addictive. As Tom says: "Crackdown is a game that simply must be played if you are at all fond of free-roaming action games." It's kind of like GTA on steroids with a splash of cel-shaded paint. As it says on the shampoo bottles - for the best results combine with a friend in co-op over Xbox Live or System Link. Wicked.

Uncharted: Drake's Fortune

One of the best, if not the best, reasons to own a PS3, Uncharted is the Indiana Jones game we've all been waiting for, except, well, it doesn't feature Indiana Jones. Instead we have Drake, an agile, quick-witted action hero who's just at home firing an assault rifle from behind cover as he is jumping and climbing his way towards mysterious treasure. While we're sure Uncharted is an action game, it's a lot like a hell of a lot of other games too. It's got a third-person shooting cover system like Gears of War and exploration and puzzle-solving that brings to mind Lara Croft's Tomb Raider. Whatever it is, if should be in every PS3 owner's game collection.

Chili Con Carnage

Tom absolutely loves this Max Payne-esque third person shooter. As he said in his review: "It's not often that I get excited about handheld games, particularly handheld action games, but Chili Con Carnage has completely blown me away and changed my view on what Sony's handheld is capable of." High praise indeed. And why not? It might not have sold bucket loads, nor has it enjoyed an expensive marketing campaign, but Chili Con Carnage is still far and away the best action shooter the PSP has to offer. An essential purchase for PSP owners.

Pursuit Force: Extreme Justice

This won't be for everyone, but I absolutely love it. I reckon it's one of the PSP's best games, and perfect for a quick 15-minute blast on the train or bus every now and again. It's a combination of a number of game types, including third-person on foot shooting, which isn't that great, first-person on rails shooting, which is a lot better, and action driving shooting, which is absolutely brilliant. As you chase down some gang goon in your Pursuit Force car you can jump from vehicle to vehicle, shooting in mid-air, land on your target's bonnet and blast the passengers into oblivion. Enough said.