Loads of fun. Love having my characters back. I like the things that keep you occupied throughout the rounds. The Panzer, and the Templars, that is. The EE is tolerable, but it's a one time completion EE, as there's no reward and continuing past the achievement will end the game. The steps of the EE are far more reminiscent of BO than what we've done on BO2. I like that.
The map itself is great, there's plenty of options for those who are picky strategists. I enjoy running around Generator 6 with my Boomhilda, my ultimate lightning staff, and another gun(most of the time a wall gun if I don't get something from the box at the beginning of the game) I'm the only one who bothers to get the airstrike lantern things every game, and those are fun. :]
The only thing I dislike is that the box has too many weapons, the odds of getting a...less than desirable weapon is a lot higher. But I solve that problem by simply not using the box.