The Enjoyable stuff: zombies, Zombies and more zombies. They really could make an entire game off of the zombies in this game. Add a couple things here and here. Infinite Replayability. Playing with friends is always fun.
The Same: Multiplayer. I never was a big fan of Blackops or Modern warfare after 2. It's different but similar at the same time. Lots of camping. Same song and dance. They added some customization between choosing being a perk head vs having a eccentric loadout of guns/addons.
The boring (IMO): The Campaign. I found it entirely forgettable and mundane.
This game to me wasn't as good as I thought it was going to be. I was some what excited about this game releasing because I enjoyed the first Black Ops and so I just assumed that I'd like this one too. Well I was wrong, this game had some strong aspects such as the campaign and the zombies were both very good and entertaining. However the online was very lack luster. The maps were very linear and just no fun to play. Between the campers (yes I do know that they exist in every shooter), bad hit markers, horrific knife registration, and then the return of the gun lottery (consistency of the guns working properly) it was just a mess. And ever since this new update they released it also seems like the controls aren't as fluid as they were prior to the games release. All in all this game is a rent, the campaign you can run through in 5 or 6 hrs tops and then the zombies while a having HUGE improvements over its predecessor still get boring after the first few times of playing. There was however one downfall to the zombies game mode and that was the new chick that you got to play as. She would NOT shut up! And with that alone I already wanted to break the game in half and call it a day. I mean every 5 seconds she's trying to be funny and she as a character is not. But that was just a bug for me, maybe not anyone else. Bottom line rent it.
Campaign - 8
Zombies - 8
Multiplayer - 5