Here is what the WiiU Gamepad has been used for on some of Nintendo's biggest games:
New Super Mario Bros U- Boost Mode... yeah you all remeber how much fun tapping blocks into the game was.

Donkey Kong Tropical Freeze- The screen was turned off -_-
Super Mario 3D World- You could tap to find hidden blocks.
Pilmin 3- Possibly the best use of the gamepad but even then people mostly play this game with a Wiimote and Nunchuck.
So Nintendo truly needs a game to show off the gamrpad, a game with mass market appeal.
Mario Kart 8... Nope
Smash Bros... Nope
Super Mario 5... Well what else is really left, but what could they do with it??







