I spent a good part of this year playing old games. That isn't unusual, but I was so busy this year that old games ended up taking time away from new. So this list is practically "games I played in 2011." Sims Social ended up being my only cut.
I could argue that Mass Effect 2 belongs on my list since I played it for the first time this year on PS3 but that kind of felt like cheating. Honorable mention to Deus Ex, Metroid Prime II, Dungeon Raid, Pacman DX CE, Lego Harry Potter Years 1-4 and Half Life that I played and really liked this year.
I wish I would've played Saints Row 3. I have Assassin's Creed: Revelations and NBA 2K12 that I have but haven't really played.
Slightly less honorable mention for Infamous that was fun for about 3/4 of the game, or Fable II which almost was a good game.