Best experience hands down was that the WiiU brought local multiplayer back into my life big time. Our group is all mid 20s to early 30s people, and it's several times a month that we meet up for Mario Kart, 3d World and more and my flatmate and I played through almost all 2 player games (with highlights being Yoshi Wooly World, Rayman and Donkey Kong TF. And Zelda with switching around players. Recently, we've started New Super Mario Bros U... quite lltp). Less gaming-enthusiastic friends even began joking how we're back to living like late teen/early 20s with meetups to eat, drink, videogames, music
(we've got our lives under control with jobs etc. though, mind you). Experience is still going on and has been going since I got the WiiU in the year Mario Kart 8 and Bayonetta 2 released. Hope Switch will carry that flag, depending on their showcase on 12th January, it might be a day 1 system. Mostly I hope for Splatoon with proper splitscreen matches, we all liked the concept but it was a bummer that the "true game" was online only.
Other than multiplayer, I was blown away by Bayonetta 1/2 and Xenoblade Chronicles X.
All that positive talk about Wonderful 101 makes me want to play it again. I have a copy but didn't really get far back then. There are only a couple of games which I've been holding off buying so far, such as Pikmin 3 or Wii Sports etc.