Ars posted an article on how they'd save Nintendo.
http://arstechnica.com/gaming/2014/05/how-wed-save-nintendo/
Nothing really profound here though still worth a read.
One thing they did bring up about the Wii U is that it's a jumbled mess of a console, and the controller is one of the biggest problems. Bulky, low battery life, and doesn't really work well for local multiplayer. That Nintendo tried to cram too much into it using a spray and pray design philosophy. That the systems aren't as innovative as people think they are, citing that most GameCube, Wii, and Wii U games would have played just as well on Xbox or PlayStation. Or rather Nintendo's hardware wasn't critical to the experience, save a handful of Wii games that did properly utilize the motion controller.
A lot of people are now agreeing that Nintendo should stop using gimmicks and stick to a more traditional control scheme.