Forza 3 is the best racing game I have ever played.  It is ridiculously realistic, ridiculously customizable, and has eaten up a good deal of my time.  Forza 3 however is not a game that are avid fans of Need for Speed and Burnout.  Those two series are not simulation driving and are not heading into that direction soon.  Forza 3 puts your driving skills to the test by forcing you to drive the way that real sports car drivers have to without killing themselves.  None of that "Speedbreaker" or drifting nonsense.  Good old fashioned driving skill is where Forza 3 stands proud.  The only unrealistic part about this game is the ability to rewind.  But, if you don't believe in such devices, don't use it.  But, it can be a godsend while racing the endurance events and you make an error around a corner after 30 long laps.  To remedy that problem all that a person has to do is press the back button and adjustments can be made accordingly.  Forza 3 also has one of the most extensive line ups of vehicles I have ever seen in a game, with over 400 cars to be customized to your hearts desires.  Whether you wanna drive a Volkswagon Rabbit, a Dodge Ram, a Lamborghini Murcielago, or the fastest car in the game the Bugatti, Forza has an offering for everyone.  The racing track listing is also impressive with over 100 tracks from all over the world, including Le Mans, Leguna Seca, and even a track that goes around Time Square.  Forza 3 is the definitive sport racing simulation on the market.