I don't agree with people who thinks that most people don't like it because the lack of Quickscoping (its an art in slow motion - i never do it and never did).
I don't quickscope, i mainly rush, play tactically on Clan Wars, and so don't have a time to Quickscope plus can't do it properly. Still, i think MW2 was a real enjoable game that gave me tousands of hours of FUN, when Black Ops just CANT deliver!
But... I love Black Ops, cos its a game, and i love games. But it just can't give me so much fun as PS3 version is ****ed right up. Basically, i'm not quickscoping, i love every cod title even B.O but for now, its a big let down for me. Finger crossed for the future.