It's fun for a few hours but gets repetitive real easy.. also the fact that there is pretty much no soundtrack in game, and without a soundtrack which actually is memorable the whole feeling is gone. I do like the concept of the fans but they could have made it much more involved in the visual aspect such as cheering you on, sabotaging other drivers etc.
EDIT : i figured out how to enable music, in audio options go to "Enable licensed music"
The horrible nature of this sound track is rivaled only by Justin Bieber, Cilion Dion, Bryan Adams and Green Day. It is effectively in the Mediocre Music Hall of Fame.
In other words: Do yourself a favor and run some music in the background.