I thought it was a pretty decent game if maybe a little too easy to warrant gr8 status. If you are a driver it won't take long to work through the storyline, controls are straightforward and the tricks are simple especially with the onscreen status and reminiders.
The bulk of the game is run in the lower categories for your atv, it is not unitl the last stages that you get the good stuff to race class "A" and that's too bad becuase they are much more fun to race, much better physics.
Worth the rent, but not challenging enough for the long haul. Fun to play, cool to look at, and quick to master.