Just sold mine this weekend.
After clocking through a (combined between us) 500 odd hours of Monster hunter ultimate, the Wii u now hadn't been touched in months. I've got a PS4 on pre order and GTA 5 to play this month, it's was never going to get used again. Took a hit of about £70 on it, which really isn't that bad considering the amount of hours it did get used for.
I want to like the Wii U, but the game support for it is beyond pathetic. Everything that's coming out that i'd want to play is coming out on next gen and there was nothing to make me want to keep it. I'd have thought about it if the virtual console had been updated regularly, but a) there's never anything new on it and b) they want me to pay over a fiver for NES games. Nope, that's not happening.
Have to say, i'm sorely disappointed in Nintendo with the Wii U. With the new consoles coming out, there's really no reason to get one and more importantly, there's a massive lack of developer support.
Shame, wanted to like it, kinda still do a bit, but it's gone now.