I am bothered only minor on the controller. Must be charged to the controller via a USB cable. I find it not thought of Nintendo to end, why not you also loads the gamepad via a USB plug? Now I have when I load the gamepad another power supply / loading aid use than for the controller.
Furthermore, I find purely aesthetic considered bad that this USB cable, which is a sufficient length, comes in gray / beige. I have a black Wii U and the controller is also black, there was no money left for a black wire? In a white Wii U do not like that so noticeable but if you put the controller directly to the console please what's the sense of aesthetics?
But those are just little things and not interfere with the game fun with this controller.