I'm playing Fallout 3, Bioshock 1 and Skyrim (the German version).
All of them are pretty cool. If you like a game with alot of missions and want to decide yourself how the game will go, Fallout is pretty cool. You can decide whether you are good or evil. I like the gameplay and the guns, though it is pretty damn annoying in the begin, seeing as you hardly have any money (caps) or guns and ammo.
Skyrim a huge game, with magic and dragons and stuff, it's up to you which missions you do up to a degree. Amazing gameplay, and you when you decide you want to be a rogue, you can also decide to be a mage. There a several skills you can master. Several things of magic, warrior, rogue, blacksmith and I believe another one but I have no Idea what it's called.
Bioshock is pretty simple actually. About a man that had a plain crash and had to go to a place called Rapture. This is a city under the sea, built by humans. Guns and genetic manupulated powers and a lot of ugly people to shoot.