The Best part about this game is the zombies. It goes back to a simpler type of play style without becoming to Tedious, The weapon, skill, and perk progression are all amazing and its mainly the reason i would recommend it to anyone else. However, that is really the only reason. The campaign is good for a call of duty story. But it borrows HEAVILY off of its predecessor in Black Ops 1. "Can I copy your homework?" "Sure don't make it too obvious." Kinda style.
Finally the multiplayer is the worst I think I've ever played out of a call of duty. The guns are boring and all feel like they were made to hype up the star of the show in its class. The new SBMM system kills any casual hopes of hoping on and having fun. You will have to rock the best weapons and the optimal perks to stay above a 1.5 KD. And the new score streak system removes any other kind of skill someone may have had. Opting for the old MW3 streaks that were specifically made to be support to the team, and then making them full blown killers. It caters to the new new players while killing the old in one swift blow.