(note, I'm not including Portal 1+2 here as they are mostly casual games that I pick up and put down from time to time. I love them, but they're not the ongoing projects of most games I play)
Mass Effect 2 (by a nose, plot is not as good as 1, but the action and playability and lack of a bloody inventory system makes a win, helped by the facts that with Gibbs savegame editor I didn't have to do any mining)
Mass Effect 1 (so much love it's not even funny)
Star Wars, Knights of the Old Republic 1 (It's everything that's good about Star Wars, with none of the shit. Rated down because the combat mixes the twin cheats of turn based combat and save anywhere, meaning every battle is a cakewalk, and it crashed a lot. A LOT)
Fallout 3 (Finally, a non-bioware game! So much love. So much love. The plot isn't as good as the above, but the fun of wandering around the beautifully rendered post-apocalyptic wasteland more than makes up for it)
Baldur's Gate (Dear god this is old, but I still love it, I played it about a million times and was still finding little Easter Eggs here and there, wonderful).
Jade Empire (An odd one, straightforward in some places, very weird in others. Fun to play if only to see what happens next, a lot of unexpected twists and one REALLY OBVIOUS one).
Baldur's Gate 2 (Again, played a million times. Still love it. The characters, the world, the plot. Love. All Round. Had less of the odd little nuggets of the first, which was a shame).
Icewind Dale (More straightforward than most RPGs, which is a shame, but it's beautiful and strange, which means I played it a lot).
Witcher (Still haven't finished it, but so far it seems like it deserves this spot. A bit too much railroading, a lag in chapter three, penalisation for not acting in a predecided way, made up for by great visuals, engaging world, fun characters and one of the best combat systems I've come across. And allowing me to play as Elric. Always a bonus)
Star Wars KOTOR 2 (Who the hell though of adding gritty realism into the Star Wars franchise? Even Lucas wasn't that dim. A perfectly good game otherwise, but didn't enjoy it so much).
Icewind Dale 2 (Some good things, some bad things, was rooting for the bad guys all the way, which fails in a game. The hacks were the best part)
Oblivion (My baseline for an enjoyable game. Oblivion was fun in places, boring in others, but still engaging enough to keep me going for 100% completion. Don't want to play it again but didn't begrugde the hours I spent on it)
Age of Empires, Age of Mythology (Fun in the same way solitaire is fun. Time killer stuff)
Fallout New Vegas (One of the few games I gave up on almost immediately. Not because it was bad, but because everything it did just reminded me that Fallout 3 had done it miles better. Five minutes in and I switched it off and rebooted Fallout 3, no need to play a pale reflection when you have the real thing)
Prototype (Another one I gave up on. Fun stress relief, but no staying power)
Black and White (Good, but not my thing)
Morrowind (Gave up on it, and it crashed before I could exit it. Haven't gone back since)
Dragon Age (Shit! Only completed it for my love of Bioware and took it back to CEX the same day)
Yeah, I like Bioware. Still not playing Dragon Age 2 though.