If you buy just one you will never find a game.
You will be put in the matchmaking just for that map pack, with the one other guy.
If you like these Black Ops 2 maps, then you will like them.
Most people don't use them, because they suck.
You just die from behind over and over, because their are to many flank routes, and the spawns have ADHD.
None because I don't like zombies