Platinum'd this early January. Overall I enjoyed it. Didnt encounter any glitches/bugs that other people mentioned. Campaign is short yes but enjoyable, I wanted to finish it (Duck and dive trophy is possibly the worst trophy ever, whoever thought of that needs shooting).
Multiplayer lets this game down big time. Yes the maps are new and some old ones, graphically its nice but my god, it had the age old problem of PC players using mods. I've played many CoD games over the years owning all but a few. This problem is getting worse. PC players need to be banned until a strong anti-mod software is available. Its ridiculous, no matter how good you are you struggle to get a 1.0+ k/d due to the modders. They arent even trying to hide it either.
Zombies is average - a new twist, for better or worse I'm not sure but the story behind it is lacking. Good if you fancy a change from the campaign or multiplayer