I'm actually surprised at the lack of problems with the Wii U. Judging from whatever comments I caught throughout the past week or so, I was going in thinking that I had bought a weight of shit for my partner. The only issue for me was at the start due to the internet connection dropping out, but that was more on my end, and the relatively slow operating system.
I played a lot of it yesterday and had no lockouts, and my partner has played Warriors Orochi 3 for the majority of today in bed and she hasn't had any lockouts either.
Maybe I am lucky.