I was cautiously optimistic about the Wii U, and ended up buying one about 2 years and 2 months ago. Overall, it hasn't really done much for me. I mean, I do use it for Hulu, Netflix, and streaming videos from my computer via Plex on the browser. But I could easily do all of this and more with Apple TV. So in terms of the actual Wii U, I rarely engage in Miiverse. Game-wise I played a bit of the Zelda remake/rerelease but grew tired of it. Mario 3D World was excellent, as was/is Bayonetta 2 (I'm still playing it). Mario Maker is fun, though i hate the timed unlocks. SEGA-wise, Sonic Lost World is good but not a game I return to often and I have no interest in the Olympics games or Rise of Lyric. I was never able to get into Wonderful 101, it's a great looking game but I grew tired of it. SMB Wii U was a freebie from Nintendo rewards and I hardly played that as well.
So 2 years 2 months later and I mainly use it for watching videos, and have only really enjoyed around 5 or so games on it.