The one thing I worry about with the controller in the amount of them we can use with a single system. I know it isn't a direct issue with the controller, but it could be really annoying.
They sidestepped the question when it was brought up at E3 and mentioned that they were still working on it. I'm trying to think how local co-op would work for games like spec ops in CoD or the likes of that if we can only use one "tablet" controller per system. It would be annoying for me and I think a big misstep to have people playing on the Wii U controller and another one with a Wiimote. In my opinion it needs to have support for at least two tablet controllers per system.
http://au.wii.ign.com/articles/117/1176175p1.html
Michael Patcher says otherwise. Actually, knowing his track record we can be in a bit of a pickle.