Dude, I'm right with you. I don't care how good a game is (and I really don't think this game is) I can't even fathom playing it for 9+ months. My wife still plays it on a nearly daily basis and I just don't get it.
Not only does any game get boring after a while but how do people deal with all of the glitchers, cheaters and12 year old fucktards constantly, especially on Live? For instance, the other day I was sitting on the couch playing PSP while my wife was playing MW2. Even with her Tritton headphones on I could hear these stupid kids screaming and singing like idiots. And then I would hear my wife say "He's using the wall glitch" or something like that, constantly. How the fuck is that fun?
I guess some people will always be sheep following the flock.