I've bought a few, but the only ones I've really played were:
ME3 - Good game, didn't like the ending. Need the DLC for it before I play through again.
Witcher 2 - Died in the tutorial, stopped playing
I do actually plan to restart it. I watched about 3 hours of an LP for the original.
Kingdoms of Armalur (or whatever. I say "Kingdoms of Amagrlrgrl") - It's like Skyrim mixed with WoW, but the areas are a lot more linear. I put a good 15 hours into it so far, but it's a little tedious. Seems like a good story if I want to get further into it, but I prefer Skyrim.
Terraria - I did like this one, once I figured out how to build a house (the first night was HORRIFIC). Stopped playing after I killed the Eater of Worlds. Not really all that interested in hard mode.
Assassin's Creed 2 - My friend got this for me, insisting it's worth it. Haven't even installed it yet
I've honestly only spent my time WoWing recently.