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The reasons are things like menus, and standard cars graphics, no matchmaking, some people complained about music, AI, damage(lawl), shadows, sounds from cars engine. These are all the things that forza has better than GT 5, although its doubtful in the case of damage and AI. What GT 5 supposedly does better, is realism in physics, premium car graphics are actually unrivaled on any platform(including PC), photo mode, karting, rally, and maybe some other things which I might or might not have left out. I have played forza 3 a bit but not gt 5 though.