Mine is call of duty mordern welfare 2 because you are able to quick scope unlikely black ops is a bit of a let down because it takes a lot of effort to quickscope on black ops.
I actually like GTA 4 it's more of a life simulation game and the graphics are great from any other games and most of all you have more options to roam, however I'm more into flight simulator for PC it's really realistic and it's enjoyable apart from the land part what happens to be a crash all the time; Even with autopilot!