I'm playing Halo 3 at the moment! Bioshock and 2 is great. Can't get on with Fallout 3,it's too big!
fallout 3 is awesome when you get into it. It kind of lost its appeal for me though once id completed the story line, although I know a lot of people who have carried on playing it for hours after completing the story line as there are lots of side quests to get on with.