I have the first Forza for the original Xbox. I thought it was good, but I've always been a Gran Turismo fan myself. Also playing GT5 on the PS3, definitely the best of the series. But I actually have more fun playing SCGT I think. Same concept, buy a car, buy upgrades/adjustments. A lot like both Forza and GT. Actual real-world driver names makes it a little more immersive (Boris Said, Bill Auberlen, etc.)