Donkey Kong Country Tropical Freeze and Rayman Legends are two of the best platformers I have ever played.
Super Mario 3D World is pretty solid too.
Breath of the Wild is great, but as of now The Wind Waker HD is still my favorite Zelda.
Twilight Princess HD is fine.
If Monster Hunter 3 Ultimate is still online, that's absolutely fantastic if you have 100 hours to spare.
The Wonderfult 101 and both Bayonetta games are amazing if you like materializing giant fists to punch things.
It's slightly too kid-friendly in my view, but Captain Toad is a pretty good puzzle game.
Super Mario Maker is amazing if you are interested in level design.
If Splatoon is still online, it is a great multiplayer shooter. Even if it is offline, I still love it's single-player.
Paper Mario Color Splash takes you out of the action a bit too often, but if you like adventure games, it's a good choice.
Super Smash Bros. is Super Smash Bros.
Star Fox Zero is not as bad as the reviews paint it. If it seems interesting to you, give it a try.
This post is running long, but here's a few other: Pikmin 3, ZombiiU, Nintendoland, Tokyo Mirage Session #FE
My Personal Favorites: Donkey Kong Tropical Freeze, The Wonderful 101, Zelda: The Wind Waker