the problem is the point at which you have the opportunity
the rating option is on the download page
how are you going to rate something you haven't driven yet?
after downloading, and leaving to play, not many seem to be bothering to take the time
to go back to that download page, just to rate the track
also, a lot of the 5 star tracks are awful, because they were made during the first few days of the utility,
and are based on one reviewer who is probably their dumb friend, Brian.
the 'highest rated' list is largely populated with overblown ratings.
the rating system will take a long time for people to even understand what they're rating,
and also for a larger cross section of drivers to contribute to the ratings, to make it meaningful