Tough call. I absolutely love Mario Galaxy. But I also really like the whole "hub" set up of Mario 64 and then twists on the individual worlds in the game for each star. I'd love something in between the two. So some epic sprawling levels, as well as some worlds with multiple challenges.
I think the main thing the galaxy games lack, is the variety in worlds so like I'd love some desert/snow/underground etc levels to go with the little planetoid stuff.








