NFS3(PC) - It was great for it time, but the AIs are rather awful.
NFS4(PC) - There is more sense of speed within this game, and the AIs are much better in this game. Physics is better than HP2, but damage physics annoys me.
NFSHP2(PS2) - I thought this was the best NFS for a long time, but a look back into this game made me realize that cars handle like snowsled and AI aren't good while it is too easy to slip by the police cars.
NFSUG1 (PS2) - This game does give me a legit sense of speed, but that's the only redeeming factor of this game. Even more so than HS. I don't like anything else about this game.
NFSUG2 (PS2) - The only thing interesting are street x and to a extent drag racing, but not much.
NFSMW (PS2) - I liked it a bit, but however, there's something here that's missing. I'd have to play again to find out. The chase can be sometimes better than HS because of alternative routes.