As a Wii U owner, I get it. They just need more games. I own Arkham City for the Wii U and the controller made an old game even better. I got Game and Wario yesterday (and it sucks compared to older Wario games--not at all what I expected) but it has a lot of exciting concepts. Nintendo Land is awesome. I play Call of Duty on the pad almost exclusively. Sometimes, I use the pad to play games like Ninja Gaiden or CoD while the TV is free to play in the background. I've even used the pad to look up solutions on Youtube for The Cave and NSMBU while I was playing the game. It's awesome.
So, just like with the Wii, Nintendo could have gone the "Faster, More Powerful, Obvious" route or they could do their own thing. While PS4 and Xbox One will once again be fighting for the same audience (which PS4 will easily win, this time), the Wii U will be for those wanting something different. Last gen, Playstation gamers and Xbox gamers chose the Wii as a secondary console. I think the Wii U will be the second console of many PS4/One users, too. Don't count Nintendo out, yet.