great single player games

I've had a 360 for a while now and most of the games I own are multiplayer focused, like Halo or Modern Warfare but I have been looking for a game with a really good single player mode and story. I've played Dead Space and Bioshock and enjoyed both and was wondering if you guys could recommend any others. I don't really care for RPGs though so something like Fallout or Fable 2, both of which I did try to play would be out. Thanks.