Every time a company decides to put a screen in its console's controller, the console fails, and ends up doing irrevocable damage to the company, no matter how many great games the company puts on the system. It happened to Dreamcast, and now we are seeing it happen to the Wii U.
As the Wii U puts Nintendo on a fast track towards a third party future, I think one think is clear: companies should not put screens on their console's controllers. They just shouldn't. It's bad joojoo.