To be fair Nintendo havent really released many first party games for the system yet, and they will be the main ones to innovate use of the pad. Already we have seen snippets of really good concepts in Nintyland and Game and Wario. The only third parties that have grasped gamepad use is Ubisoft, Rayman Legends is the definitive version on Wii U due to its use of the second screen. Zombi U is also very innovative with its use of the gamepad. Watch dogs looks to have good gamepad implementation too, and find me any console on the market that offers off screen play.
If Playstation 4 and Vita combined offer a similar experience to Wii U, im sure 2nd screen gaming will suddenly become the most amazing concept ever.







