The game I play the most on my xbox 360, is Call of Duty 4, occasionally swapped with Halo 3.
I prefer CoD4, but Halo 3 is good for online split screen. CoD4 can get a little boring waiting for your turn, but I still loved to play it regardless.
A new game’s taken over though :O, Unreal Tournament 3 :D. I don’t know if it’s because it’s better than CoD4, or because it’s possible to do split screen online, but it’s definitely taking up a lot of time. I’m making this post in between my gaming gap.
If anyone’s interested in having an UT3 online match soon, just post your 360 gamertag here and when’s good for you :D.