I played Call Of Duty 4 for about a month. It really took a hold of my life which wasn't a good thing! I generally played with alot of people I've known from COD2. #4 is superb but I just find #2 is more fun to play.
My 360 is knackered again now. I'll be getting it fixed & sending it on to my sister. I just find I don't have the time for gaming & art stuff together anymore. One has to go. I just wish there were more hours in a day. 

If people don't mind dated graphics but love games with story & intrigue, try the THIEF series. This was the first true stealth game.