....I never managed it either! 5 minutes trying and it was a case of 'ahh this is sad!' Rainbow Road I managed a couple of times....I never actually managed to do the wario stadium glitch. My little brother on rainbow road on the other hand.... at his peak I swear he had it at about 90% success rate *every lap*.
Think Diddy Kong Racing (and CTR) have already been mentioned, clearly the better kart racers in that generation!
Hmmm.. 7 Mario Karts (and I've got/played them all) - list time:
1st - Super Mario Kart
2nd - Mario Kart DS
3rd - Mario Kart Wii
4th - MK 7
5th - MK Super Circuit
6th - MK Double Dash
7th - MK 64
I'm torn between 1st & 2nd though, it's close! As is 3rd & 4th!