So all-in-all Race Pro has it's pro's and con's. The AI is so bad it seriously takes 25% off the final review score. If only they allowed you to have a more challenging AI without making the cars slide all over the place with no traction control. There are plenty of game modes to keep you busy, so the hardcore gamer should be satisfied when playing on the Professional difficulty setting.
If you are a hardcore racing fan who is looking for a fill in game until Forza Motorsport 3 is released, then buy it. Everyone else should rent it if your looking to set some fast lap times.