I dont think the Wii U library is as great as people make it out to be. Most of Nintendo's titles for Wii U were extremely safe sequels, lame spin-offs, games that lacked ambition, or remakes.
3D World while a fine game. Can you honestly tell me 3D World had as much effort and ambition put into it as Galaxy or Odyssey?
Tropical Freeze is a great game and one of the best 2D platformers of all time. But at the end of the day it was still a relatively safe sequel to DKCR.
Star Fox Zero, Amiibo Festival, Color Splash, Ultra Smash, Mario Party 10, Pokken Tournament, Game & Wario, and Kirby Rainbow Curse were all extremely lackluster releases to pad out a release schedule and some of these games are just downright terrible.
Xenoblade X, Bayonetta 2, Wonderful 101, and Tokyo Mirage Sessions were all great games (I hear only played Bayo 2) but they were all extremely niche games that only the hardest of the hardcore Nintendo fan would give a crap about. None of those games were system sellers.
Wind Waker HD and Twilight Princess HD. The former is a fantastic remake that improves on the original but is still a remake of a game most have played. The latter is a cheap cash-in slightly up ressed port of a 2006 game with a new "dungeon" locked behind an amiibo.
New Super Mario Bros. U was just another mediocre play it safe bland by the books game in the "New" line.
Yoshi's Wooly World, Bayonetta 2, Captain Toad, Super Mario Maker, Mario Kart 8, Breath of the Wild (though I'd hardly count this as a Wii U game), Smash Bros. Wii U (even if its my least favorite Smash), and Pikmin 3 were the only true FANTASTIC original Wii U games IMO. 8 games in the span of 5 years...
EDIT: Splatoon was great too but the problem was that game launched so bare bones and took a year and a half to get fully featured by the time the game got all the content it SHOULD'VE launched with the small Wii U userbase moved on. Not to mention Splatoon 2 trumps it in almost every way...