You have some very valid opinions.
While PGR3 is a brilliant game, and it gives you that great arcade feel, other then the use of real cars and real cities, there isn't much else sim about it.
Much like scooby said, there are plenty of 'assists' in Forza to give you your arcade feel, WHILE still giving you your upgrades. If you are already a fan of PGR3, then Forza2 should be an automatic purchase.
In regards to the soundtrack, thats fine to. I have plenty of friends who don't have any specific 'tastes' and like the randomness of game soundtracks. That is not a back handed compliment. The beauty of music and heck games, is to each their own.
With that being said...5 weeks and counting. This will be another Day 1 purhcase (PGR3, Condemmed, Oblivion, Dead Rising, Gears, Lost Planet, Crackdown,) for me. This will be more games I have purhcased day 1, then I have in my last 20+ years of gaming. I don't know what that says, but sounds like a bunch of good games to me. None of them have dissapointed me yet.