I think Nintendo tried to push the game. I remember the Youtube ad where the trailer would play and the Youtube page would start falling a part. But Wario is not as popular as Mario, Luigi, or Peach and this plays into the sales of Wario's side-scrollers. Another thing is that there are not many Wario side-scrollers developed by Nintendo for Wario to have an established fanbase.
Those are my thoughts and I could be wrong.



If Nintendo is successful at the moment, it’s because they are good, and I cannot blame them for that. What we should do is try to be just as good.----Laurent Benadiba







