I don't know why everyone is having trouble with the camera. I find the lock on to work pretty damn well, and the psp versions didn't have that either but I had no problem. With the circle pad pro I'm sure it will be better though, although I am not having a problem with using the digital pad on the bottom screen. But again I'm sure it will be much easier with the circle pad pro, the wiiu version definitely has better camera controls. maybe I'm just used to it or something but I don't find the camera to be hard to use at all. Underwater I agree, it's definitely much more difficult on both systems. I never got used to it in tri and probably won't get used to it in ultimate either. btw lance is where it's at if you want to kill Plesioth fast. The lance charge works really well underwater.
I'm normally a greatsword player but i'm also loving the dual blades. I can actually kill off Lagombi much faster with them compared to the greatsword, and the status effects are a plus.