Pro Street is kind of an attempt at copying Forza with a NFS twist on it. The modifications might be better in NFS but that doesn't make the actual racing any better. Forza is the best game as far as PURE racing goes. And even as far as modifications go, NFS isn't the best.
Visually, no. Physically, yes.
I wouldn't go as far as to say NFS was a carbon-copy of Forza, I mean the game was in development since the release of Most Wanted. If you skim the surface, the game is sheer ownage. If you dig deep, then you could say those things about it being a Forza wannabe. But no way was it copied.
[Edited by Chingy42007, 1/27/2008 4:44:06 AM]