Stability: 8/10 - Crashes once in awhile
Graphics: 10/10
Speed: 10/10
Difficulty: 10/10 - I couldn't figure out how to change the AI to make it easier since it made no sense to me. I think that the author should have put a little more effort into the readme file.

Gameplay: 10/10. Great work on the AI of course. It is a lot more fun to race against an opponent than to race against time. There are ten circuits to race at, with five different cars. This is a very speedy game. All the ingredients for a 10/10 in gameplay!

Graphics: 9/10. The cars are very well drawn. The circuits look plain, but they’re good enough to find your way on them.

User-friendliness: 7/10. It took a while to get used to configuring the AI. The parameters sometimes make no sense at all, and there's no section in the Readme file that explains how to use that. But everything else is almost self-explanatory.