I laughed hard at the "evergrowing library" part.
Anyway my list is this:
1- Super Mario 3D World
2- Pikmin 3
3- The Legend of Zelda Wind Waker
4- New Super Mario Bros U
5- Monster Hunter 3 Ultimate
"I've Underestimated the Horse Power from Mario Kart 8, I'll Never Doubt the WiiU's Engine Again"