Story mode sucks. Too much scripted events and videoscenes. Also having to drive around in cars or playing command&conquer style "tactical" missions where you move around units is not what i want to do in a 1st person ego shooter.
Last but not least the zombie mode has gotten way, WAY too mainstream.
Online is really really good on this one, massive step up from black ops 1, unlike mw3 which was just mw2 but with a few different game modes and guns!!
Zombies haven't got into it yet, was madly obsessed with it on black ops 1!
I only started playing it cos the clan I teamed up with ($HOT) only play that.
Had to play Domination on the last game though cos they didn't bring CTF in until the summer and it was **** lol.