I really can't understand this antipathy towards this new Mario game. Hasn't every Zelda game follwed what is essentially the same formula as it's predecessors with a new gimmick or two?
Even with the transition into three dimensions, they kept the core gameplay, and those games would have worked in the old top-down format.
Look at the DS iterations of Zelda. Quite similar to the SNES/Gameboy era. Utilizing the stylus, but essentially unchanged.
Adding new elements to a much-loved formula is okay.
What I'm worried about is Mario Galaxy 2. Couldn't they think of a new setting?