Lets see. I'm quite the gamer, formerly console but slowly moving onto PC gaming, which started with Warcraft. I currently play in order of most to least...
World of Warcraft: Given the erroneous comments about roleplayers earlier in the thread, you might be quite surprised to learn that we're not all like that, and the wide majority of us don't go around pretending we're elves. Still, roleplay keeps me coming back to Warcraft, not to mention the friends and community you build within the game. I've just started a guild on Argent Dawn, Hordeside, that's like based on Old Horde (Orcs, Trolls, Goblins, Tauren) sorta side of things. Still, I'm blabbling but just throwing it out there. Contact Kahluss.
League of Legends: Free game, addictive as hell and has quite the amount of depth and is pretty much constantly WEEKLY updated. Game is funded through micro transactions for boosts and skins for your champions. It's very competitive and unfortunately this leads to some unsavory types within the community. It's still a right laugh though, and is probably one of the most satisfying experiences in gaming when you win. It's easy to pick up and hard to master.
Star Wars: TOR: Bioware are one of my favourite companies and I loved KoTR and really love the Mass Effect and Dragon Age series, but I find that this game is somewhat harder to get into. I don't know whether it's the companions, the questing areas barren of life or because it's not quite like your traditional MMORPG, but I can't quite get into it. Still, the graphical quality and customisation is top notch, as are the conversation choices.
Minecraft: I can't play this without friends, and even then I find it can become a little tedious. It's quite popular and would reccomend it to anyone who is creative.
Diablo III: I actually got this game free, as I signed upto WoW for 12 months, and I gotta say, I am very impressed with this. Play this with your mates, over skype on a hard difficulty and you'll have a fucking good time. Very few games literally let you punch a giant worms head off. Or a Giant Goat Man. Or a big fat horned demon effort. It's bloody good, if not a slight bit short.
Killing Floor: Very good wave survival game, if not bloody difficult, again, play this with your mates and shit yourself as a Fleshpound (Google it) comes up behind you and one bombs you.
Left 4 Dead 2: Valve are one of the best makers of games today, Left 4 Dead with mates on Expert, and you'll be buzzing or ripping your hair out after getting woman slapped by a zombie three times.
Portal 2: Innovative isn't the word. A welcome break from violence, and one of the only genuinely humorous games about. Stars Stephen Merchant and JK Simmons. The Multiplayer side, is a helluva lotta fun and will make you think hard about how to solve the puzzles.
Anyway, I'm a bit of a lurker on here, but if anyone is ever up for a game, throw us a message!