1) Super Smash Bros for Wii U, I'm still playing to this day, amazing online!
2) Donkey Kong Country: Tropical Freeze, I absolutely loved this game to death!
3) Pikmin 3, one of the games to show the beautiful graphics the console can handle!
4) Bayonetta 2, what an outstanding piece of software!!!
5) Xenoblade Chronicles X, one of the best RPGs this gen, beautiful graphics.
6) Yoshi's Wooly World, simple and beautiful, and so much fun.
7) The Wonderful 101, a hidden gem from this gen, it's marvelous.
8) Super Mario 3D World, can't explain how much fun I had with this game.
9) Tokyo Mirage Sessions #FE, such an awesome J-RPG!
10) Hyrule Warriors, one of the biggest surprises this gen.

Honorable Mentions: Capitain Toad and Paper Mario, both big surprises, and awesome, fun games. I loved them.

The WiiU had some fantastic games, can't deny that. It's a shame it died so early, that gamepad was an awful idea, very unfortunate... But the games it received were superb, I will remember the WiiU for it's great catalogue of HQ games.

Based on what I've actually played

1. The Legend of Zelda: Wind Waker HD
2. The Legend of Zelda: Twilight Princess HD
3. Super Mario 3D World
4. Super Smash Bros. for Wii U
5. Mario Kart 8
6. Donkey Kong Country: Tropical Freeze
7. Nintendo Land
8. ZombiU
9. Hyrule Warriors
10. New Super Mario Bros. U

I have Bayonetta 2, Pikmin 3 and Woolly World too, but haven't really played them yet. Bayo 2 and Yoshi would most likely be in there somewhere if I had though.

Xenoblade Chronicles X

Bayonetta 2

Tokyo Mirage Sessions #FE

The Legend of Zelda Breath of the Wild

Mario Kart 8

The Wonderful 101

Splatoon

Super Smash Bros Wii U

Hyrule Warriors

Super Mario 3D World

1. Super Mario 3D World

2. Xenoblade Chronicles X 

3. Nintendo Land

4. Minecraft Wii U Edition 

5. Super Smash Brothers For Wii U

6. Donkey Kong Country: Tropical Freeze

7. Pikmin 3

8. Kirby And The Rainbow Curse

9. The Legend of Zelda: The WindWaker HD 

10. Splatoon

Most underwhelming: New Super Mario Bothers U 

Least Favorite: Captain Toad Treasure Tracker

1. The Legend Of Zelda: The Wind Waker HD
2. ZombiU
3. Donkey Kong Country: Tropical Freeze
4. The Binding Of Isaac: Rebirth
5. Shovel Knight
6. Bayonetta 2
7. Bayonetta
8. DuckTales Remastered
9. Mario Kart 8
10. Super Mario 3D World

Something like that...