13 - Mass Effect 2 (ps3)
A pure quality title, I only thought the middle part of doing missions for your allies dragged on a little too long and that the ending was a little underwhelming. Mass Effect 1 has the better ending, but a weaker start.
12 - Bioshock (ps3)
I played the demo for this long ago and didn't like it, yet with such a ginormous metacritic I couldn't keep ignoring it. When I did play it, it had great atmosphere. It's a little survival horrorish, which gives me the creeps, so that I don't want to play it for too long at a time. Thus I've played it only once, which isn't quite good enough for being the best game ever in my book.
11 - Rome Total War (pc)
Rise of Nations came close, but Total War is exactly the kind of strategy game I wanted to play. It really has a lot of depth, which you can safely ignore if you feel overwhelmed. This is here because it's not the first Total War that I played, had I played this first I'm confident it'd be in my top 10.