Rayman Legends was the result of a concerted boycott and subsequent malaise, and Ubisoft rightfully earned that treatment.
I don't buy 3rd party games generally because I find most of them boring. If I wanted those kinds of games I'd buy an XBoxOne or PS4. Meh.
That being said, my favorite game on the WiiU is a 3rd party game: Lego City Undercover. There's always exceptions.