Bowser or Yoshi on ROBs motorcycle is awesome. Try that.
I can whup snakers. Snaking is using a glitch in the game (Originally from F Zero) where you use a maxed out acceleration combo (I.E. Toad in the Egg car) and you move back and forth rapidly generating an exponential speed increase. However, if you know the track and move more into High speed with a medium acceleration cure (I use Yoshi in Robs standard car) Through skill you can beat the cheaters. They will usually turn their games off when they loose to keep that 100000000 wins 0 losses though.
Most people quit after the third race with me. Because usually I win the first three, then my oppenent realizes that they can't win, and they shut the game off.