I'm not disappointed in what my WiiU can do. Nintendo has to react to the market at some point. I think I could say I was mildy disappointed by gamepad utilization as a whole, but there are a few good experiences so far. I really think Splatoon, ZombiU and Metroid Blast on Nintendoland did a great job and we still have Mario Maker and Star Fox to try out(and potentially Zelda).
I have quite a few titles for it that are fun to play or were at least worth a completion or two. I think I have 44 WiiU games on disc and I was only really disappointed with a few of them.
Bayonetta 2 and Lego City: Undercover are two of the best games I've ever played and the first party stuff is top notch so as for quality it has excelled in my opinion.
My PS4 is collecting dust at the moment(Alien Isolation, Outlast and Shadow of Mordor were amazing). I just bought an Xone(Killer Instinct is great) in July and its got quite a bit of use, but I still play a lot of MK8, Splatoon, Smash and Super Mario 3D World. That isn't a knock against PS4 or Xone either, it's just I did those types of games from 2000ish until 2012 when the WiiU came out. I hit a big back catalog of Wii games I passed over in Gen 7 plus the WiiU exclusives and some really good 3rd party games(Deus Ex, Shovel Knight, Child of LIght, Need for Speed, Skylanders Trap Team).