I won't compare the multiplayer, since I don't play CoD online for many reasons. Also, I didn't play CoD2 and CoD3 (and all the other random ones).
Anyways, I remember when I played the single player campaign in MW for the first time, it was awesome. When I look back at it though, I think WaW had the better one. Then MW2 released and I thought the last couple of missions in it were brilliant (the intro to the Gulag mission still impresses me today). Black Ops' campaign is complete shit, 'nuff said.
Now, for replay value, WaW has Zombie mode, but Black Ops' is better. MW2 had Spec Ops and I've had lots of fun with it with friends. Black Ops has Combat Training and that's a big plus, but it's still CoD multiplayer (I get bored with it easily).
So, for the overall package I prefer MW2 over the rest. I'm probably the only one though...
Random game thought :
Why is Bionic Commando Rearmed 2 getting so much hate? We finally get a real game and they're not even satisfied... I'm starting to hate the gaming community so f****** much...
