Double-Dash should never be above 64. Never. 64's tracks were much more challenging and inspired. Other than DK Mountain, Baby Park, and Yoshi Circuit, DD was a massive disappointment from a track standpoint.
SMK is archaic and should not be above Super Circuit (which contains all the SNES tracks anyway)
DS destroys 7. It's not even a discussion.
Wii should be higher. That game was fun as hell when it came out, and the online was actually decent (bonus points if you did online co-op).