There’s a frustrating glitch on the Wuhu Island track in Mario Kart 7 that allows lesser people to skip quite far ahead in a race, and unfortunately Nintendo has no plans to fix it. Here’s what they said:
We are aware that it is possible to navigate a certain part of the track in Wuhu Island in a way that allows a large part of the course to be bypassed. There are no plans to update the game to remove this shortcut as doing so would create an unfair advantage for the users of the original release of the game. Rest assured your comments have been added to our records for Mario Kart 7.
Grrrr. That about sums up my feelings. Grrrr.