Breath of the Wild
Mario Kart 8
Super Smash Bros
Donkey Kong Country: Tropical Freeze
Monster Hunter 3 Ultimate (Definitive version of the game, basically)
Yoshi's Woolly World
Pokkén (no, really, it's good)
Tokyo Mirage Sessions
Super Mario Maker
Captain Toad: Tresaure Tracker
And this is only going by memory
Really anon, it can be a pretty long list and i'm leaving out experiments and third party ports.
And then you have Wii backwards compatibility, Nintendont and a pretty long list of emulators via Retroarch (Wii U version of Retroarch has an special emphasis on input lag)
It's a nice emulation machine for flat panels. It only needs a working PSX emulator and it will be perfect.
Basically, is a flawed but great little machine.