If Sunshine didn't have FLUDD/the whole "graffiti" concept, overreactive controls, and tedious side-missions like Blue Coins, then I would have considered it a good game.
I basically want my SM64 back. Like Cook said, I also like levels were you have to do a little exploration instead of just following the coins/Star Bits all the way to the Blast Star. I mean, don't get me wrong, Galaxy 2 was one of the best games i've ever played (particular because every level seemed to have some sort of different mechanic to it), but I like it better where you have to do some thinking for yourselves. Miyamoto should go take a look at Banjo-Kazooie/Banjo-Tooie for inspiration. Both of those games had you hunting down Jiggies where you'd probably never look.