I'll review this game as if the campaign didn't exist. Multiplayer tried to do some creative ideas like introducing wall rides and specialists, both of these new 'features' felt like absolute gimmicks to me. I prefer advanced warfare multiplayer over this one.
The Zombies though, Zombies reached to it's fucking peak in this game. Too many maps to play, plethora amounts of Easter Eggs to do. And they also remastered the old maps into this game. Not only that, but you can even download custom zombies on the steam workshop. This game is top tier for Zombie fans. And I highly recommend getting it only for the Zombies mode alone. Get it only for PC though