I traded this in around two months ago, we've had loads of fun playing locally and co-op online, of course, not to forget the games I've had with other N-E peeps.
The GamePad use was excellent. The quality wasn't compromised either, unlike some others Wii U games.
Anyway, no controller faffing for me. I'm perfectly happy with Pro Controller/GamePad controls. Very comfortable.
Ghosts should definitely have Wii mote controls. Black Ops II had an excellent variety of control schemes.
Wimote + nunchuk
Wii Classic Controller
Wii Classic Controller Pro
Wii U GamePad
Wii U Pro Controller