... Although I know I'm in an extremely small minority, but Galaxy 2 did bore me.
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I think I might like to see a very 'Super Mario World' theme for a future 3D Mario...
This cartoon did a lot for my imagination as a kid, and of course having a love of dinosaurs anyway! :p
When I say I think there's a lot more Nintendo could do with Mario in terms of cutscenes or story, you only have to look at how fun these episodes were; ok they were somewhat naff, but they brought the characters out so much more, instead of Mario just being a vessel to get from A to B as he is in the Galaxy games.
I loved the personality of the Koopa Kids, Kamek, and even how generic enemies like mecha koopa's, or Blargg's had character and humour.
I don't feel that's been done in a 3D Mario yet... and I imagine it's why people love the Mario RPG games so much.
There's also ALOT of potential in terms of a graphical style... I don't know, I really think Nintendo could do a great Pixar/Ratchet & Clank esque adventure if they wanted too.