While innovative, Black Ops II implements many things into the multiplayer that can ruin the game for some.
Zombies mode is back and with four new characters. Although it is one of my favorite things in the game I will admit that it is not as fun or addicting and its was in the original black ops.
The multiplayer is by far the most popular thing in black ops 2 and at times is the most disappointing. The game implements the new "pick ten" system which let's you choose ten thing you want in you class. This unfortunately includes the target finder which points out enemies in red demands as long as you can see the person. This show people enemies that they would normally miss. The maps also are not diverse enough. They consist of tiny to medium sized maps. The big ones are to cluttered to allow for sniping to be practical. This leads to very fast paced action that can be a thrill. But often for new players they aren't used to this and start to camp. Which can burn people out very quickly.