I love mario kart. I can never find friends to play with me though. They get butthurt that I always win :/ I've never tried playing online on the Wii though.
My favorite version is the SNES <3
For some reason I never owned the N64 version, but I've played it at friend's houses. My DS version was stolen(yay stupid ex-friends), but I still have my Wii and SNES games.
I think I've only completed two classes on the Wii o.o;