After three hours with the Wii U version, I'm having fun. Unfortunately, I can't judge the most important part yet: the maps. I think I like the large sizes.
The connection on Wii U is smooth, and the pointer controls work great. Everything feels right, although I feel like maybe the characters have a little heavier movement in this. Not that I mind.
My biggest complaint so far is the unlock system. I'm not a fan of CoD's multiplayer unlockables in general. I feel it discourages experimentation and counterintuitively rewards the more experienced players with better weapons and gear. But the Squad Points system is egregious even for my regular complaints.
You only get three loadouts, and everything is so expensive to buy for points. I'm at Rank 7, and I've bought maybe 3-4 things. I can't experiment at all. I'm still stuck with the same two ARs and one SMG I started the game with. They could do a Quadruple Squad Points Weekend for the whole year, and I still wouldn't be able to unlock everything I want to try. It's discouraging, and it makes the beginning game more boring when I'm stuck with the same weapons and attachments.
Also, the spawn system is pretty bad. I've benefited and been killed by it, but I shouldn't spawn directly in front of (or behind) an enemy. This even happened on that enormous castle map.