The WiiU version of Rayman Legends is one of the best platformers of all time, IMO. Top 5, probably.
Mario Kart 8 is the best game in that series, and probably a top 25 game of all time
Those two games alone make the Wii U a worthwhile system. Add to that a handful of other great games, and I am very happy with my purchase.
With that said, that giant controller screen thing is ridiculous. It looks like 90's tech, especially when compared to other tech that was on the market around the same time, like ipads. It turned off many people, I'm sure. And, frankly, anyone that thought it was a good idea to bring that monstrosity to market has no business making those kinds of decisions.