TROPICAL FREEEEZE!

Yep, I admit I cheated a little with Bayonetta lol. But, hey, both of them come in the same pack ;)

Its very underrated everywhere. Even here.

1. Super Mario 3D World
2. Bayonetta 2
3. Mario Kart 8
4. Super Smash Bros.
5. Pikmin 3
6. ZombiU
7. Donkey Kong Country: Tropical Freeze
8. Captain Toad: Treasure Tracker
9. Hyrule Warriors
10. The Wonderful 101

Keep in mind that Wind Waker HD would be at the top of this list if it wasn't a remake. I just don't feel right saying that a remake of a GameCube game is the best the Wii U has to offer.

So...when I played DKR, I really felt that the game was best played Co-Op.  I lost my Co-Op buddy half way through and the last time I went back to play it solo I just wasn't into it.  That's my biggest concern with dropping $50-$60 on this title.    

Still missing Super Mario 3D World and Hyrule Warriors so...

1 - Mario Kart 8
2 - The Wonderful 101
3 - The Legend of Zelda: Wind Waker HD
4 - Pikmin 3
5 - Super Smash Bros.
6 - Captain Toad: Treasure Tracker
7 - Donkey Kong Country: Tropical Freeze
8 - Shantae and the Pirate's Curse
9 - Bayonetta 2
10 - New Super Mario Bros U

1. Zelda Wind Waker HD
2. Pikmin 3
3. Super Mario 3D World
4. Mario Kart 8
5. ZombiU
6. Nintendo Land
7. Donkey Kong Country: Tropical Freeze
8. Captain Toad: Treasure Tracker
9. Hyrule Warriors
10. NSMBU

In Tropical Freeze I don´t recomend the Co-op. It makes everything  harder than it is. The game is made to be single player and is more hardcore than Returns.

EDIT
Honorable Mentions: Sonic Lost World (Underrated Sonic game. Pretty decent) Assassin's Creed IV: Black Flag (Actually decent even though the frame rate is the worst in the Wii U version)

10. Bayonetta 1 (Great game, that was a great first attempt at a new franchise)
9. New Super Mario Bros. U (It's 2D Mario! :p)
8. Shantae and the Pirate's Curse (A DAMN good indie game!)
7. Super Mario 3D World (Really good 3D Mario game!)
6. Hyrule Warriors (Sooo much Zelda goodness! Killing everything! The Wii U game I've spent the most amount of time on by far, even more than Mario Kart and Smash!)
5. Donkey Kong Country: Tropical Freeze (Excellent 2D Platformer! Very excited of DK64 on the Virtual Console by the way! :D)
4. Mario Kart 8 (Best Mario Kart to date in my opinion)
3. The Legend of Zelda: The Wind Waker HD (Fantastic remaster of my very first Zelda game!)
2. Bayonetta 2 (One of the best games of 2014, absolutely amazing!) - BAYONETTA FOR SMASH!!..speaking of which..
1. Super Smash Bros. (It's Smash Bros!!)

I haven't played Pikmin 3 or Wonderful 101 so I can't comment on those games. :p

I can't make up my mind over rankings, so I'm just gonna list my 10 favourite games in no particular order:

- Deus Ex: Human Revolution
- Super Mario 3D World
- Super Smash Bros. for Wii U
- Mario Kart 8
- The Legend of Zelda: Wind Waker HD
- Darksiders II
- Batman: Arkham City
- Shovel Knight
- Splinter Cell: Blacklist
- Nintendo Land