You should get someone else gamepad and check if you can sync that with your wii U system, I'm pretty sure your wii U isn't broken and it's just something with the video output.
Well the 1 and 2 button are mapped to A and B or X and Y, so it's impossible to play for example super mario bros. Here is a link of a good review IMO:
EDIT: sorry wrong link :)
It works on vwii and probably also on emulators since it's actually just a wii remote. Just know that this controller isn't compatible with wii u games as it won't be detected as a wii u pro controller but as a wii remote. I've also seen some very bad reviews about this thing.
There is an in-game hint stone, which should be enough to guide you through the game. :D
EDIT: And playing a game without a walkthrough makes a game much better.
I got exactly the same problem, got the same card with rts on the front and the dorasu logo, when I sent a mail to the producers of the card, but they say they will make a fix, but they said that also with the previous patch...