When I get the game I will post my opinion, but from the pictures I saw,
Toad Road: Looks great and has good scenery.
Factory Level: Looks pretty nice, snot very scenic but the conveyor belt thing looks interesting.
Boo House: Haven't seen much of it, at all.
Blooper Beach: Looks good, haven't seen much but looks good.
Magma Mine: the concept sounds really good, I'm personally looking forward to this one.
Bowser Level: Looks sweet from the picture, haven't seen any gameplay but t looks great.
DK Level: don't have much of an opinion here, but Diddy's there so that's pretty cool.
Sorry if I didn't write the names properly, on iPad.