Black Ops isn't even out yet, and for all you know, this game could be terrible. I'm saying this because I, among many others, put Modern Warfare 2 as the greatest game ever like 8 months before it came out, and we were all far off. MoH could be pretty good because DICE is making it and they don't suck and put out patches like every day. I would by a 360 for Reach, and Bioshock Infinite isn't out yet either, don't know much about that. I like Combat Arms.
But onto my favorites. I loved WaW and CoD4. Had so much fun with both of those games. I miss the good times.