No, Mario 3D World isn't worst selling 3D Mario game because game is only 2 year on market and still is selling, when the game is not able to buy any more then will know if is worst selling 3D Mario game. But with this rate of salling probably will pass Sunshine.

I dont understand what Wii U failing have with Mario 3D World sales!? Its only points that game is very popular and its selling great despite small user base.

Do you realize that Mario Galaxy was sold around 13m on instal base of 100m, while on 30. June Mario 3D World was on 4.3m (this certainly is not final number) on installe base of 10m!?

You know Galaxy and Galaxy 2 weren't anywhere close to 64 openness levels, right?  Do they not count?  And what you mean by "do 3D better" is "do 3D the way I want.". Nintendo experiments, that's what makes them great.  And you show exactly why I am glad fans don't run Nintendo because we wouldn't have Sunshine, Galaxy, Galaxy 2, or 3D World, but instead Super Mario 64, 64 2, 64 3, etc etc.  Every game won't be your new favorite, of course.  But experimentation is how you can wind up with games that you never knew you wanted.  But regardless, 3D stands for Three Dimensional.  And that's exactly what 3D World is.  How they structured the game is neither here nor there.

Yeah, that seems to be the overall opinion of 3D World, though it makes me a bit sad.