In comparison of forza 4 and Gt5. GT5 has what seems to be a pretty amazing cruising highway track but 75% of the cars look like shit vs Forza 4 having a up to date list of cars and great community aspect that lets drivers like me still have fun online without having to join a public race.
I'd be willing to get a PS3 and Gt5 just for the highway track but the car models throw it all away.