I think this is a great idea! I like it that it's anonymous, but the results are public. For a suggestion, at the moment, I can think that one could rate different aspects, like good design, fun to race and maybe something else. This could be optional too, like, by default it's only one rating, but if you click something, it splits and the general rating is the average. If you don't split it, all ratings are set to the general rating. Anyway, it's already great as it is. What I'm suggesting makes it a little more convoluted perhaps, but maybe it can serve as an idea for some other feature.