Prostreet sucked major cock.

But Undercover is going back to why it was so awesome.

My personal fave was Most Wanted though.

I'll make a short list (from what I can remember)

Bad                         Mediocre         Good                             Great
NFS Pro Street     NFS Porsche  NFS II SE                     NFS Hot Pursuit
                                                         NFS High Stakes        NFS Hot Pursuit 2
                                                         NFS Underground 2   NFS Underground
                                                         NFS Carbon                 NFS Most Wanted


note: unfortunately never got the chance to play NFS I