I thoroughly enjoy the Wii U. I use it for a lot of things, from random web browsing, to Netflix, to Wii and Wii U games. I have just (in the last few days actually) finished Pikmin 3. I never played much of the first or second games, but I have to say, part three was an excellent game through and through. Highly recommended. Unfortunately, funds are tight for me right now, so I am probably not going to experience the Wonderful 101 anytime soon, which I hear is AWESOME (which I was planning buying on day-one, which was yesterday).
I also recently did the Wii to Wii U system transfer. It was really a tear-jerking experience, as lame as it sounds. As my data was transferring (and the Pikmin animation was happening), I realized a console generation for me had officially come to an end. All of my data was no longer available on the original Wii I had been using it on for the last several years--it was now stuck on my Wii U. As saddening as that was, whenever I pop in an original Wii game on the Wii U, I can pick up right where I left off on my original Wii. Very cool stuff. I picked up on my Mario Galaxy save game the other night, for instance, trying to pick up a few extra stars I hadn't obtained before (despite have already seen the ending to the game).
The WiiU is the only console that's doing something different. All other consoles are the same controls and FPS's i've been playing for the last decade. WiiU is not a brilliant system, but it offers something unique at the moment.
Despite its lack of power compared to the PS4 and XBOX One, this is what I appreciate about it. It is doing something different. I like its different take on an online console community (re: MiiVerse), and I really appreciate the tablet controller itself. The controller has cool uses outside of games, too. With the internet browser capability, I have been using it as a tablet (literally) to look up terms I catch while studying for my Security+ certification. The controller doubles as both a gaming pad and a tool, which I think is awesome. I can't do the same with my XBOX 360. Sure, I have a smartphone.. But it's not quite the same, and I'm not spending hundreds on an actual tablet itself. The Wii U is the best of both worlds.
The only real concern of mine is the lack of games, but even that I haven't cared *that* much about outside of hoping it catches on with the general public (which is what Nintendo needs for this system to survive). As my time gets more and more limited for modern titles that take more than an hour or two to finish, I don't care as much for super-frequent releases, as long as they are good releases.