I have forza 3 and i have to see it is very similar to forza 2. But the differences make more them make up for that. I LOVE the cockpit view, it rocks!!!!.
Also i love that when the computer is set to easy, it actually makes mistakes..... And actively avoids impacts in a resonable manor.
also the car selection is very nice, i love the trucks to mix things up and the roll overs is neat. ie: sticky tires stock car= flip over if hitting rumbles on a turn.
One final note is the tracks!!! yes the down hill is back Woot!!, and Le Mans come on 240+ in the veyron is win.
although i do with i bought cod mw2 instead , oh well.