From the PlanetXbox360 feature review:
"When in comes to racing games the Sony lovers have their Gran Turismo series and Microsoft fanboys have Forza Motorsport, both games very focused on offering a simulation-like experience to the player. The rivalry has been going back and forth for some years now with each game in the series producing better results than the last, and so it continues with the release of Forza Motorsport 3 for the Xbox 360. This is the second Forza title to be unveiled on Microsoft's next-gen console but the improvements over its predecessor are of epic proportions. Some of the largest complaints about Forza 2 were about the game's accessibility and how it really only appealed to the hardest of the hardcore racing gamers, number 3 is much better in every way. This time around developer Turn 10 has made all kinds of tweaks and additions to make sure that all experience-level players can have a good time with the game. Going into this review we were not sure exactly what to expect, 3 days and 50+ hours of gameplay later and one thing has been made crystal clear: Forza Motorsport 3 will compete with the big-dogs of the racing genre and is a simply stunning video game.
Whether you are a racing game guru or just looking to wet your feet in the genre make sure to pick up Forza 3 when it hits stores later this month, it's simply the best racing game ever created."