This just goes to show as further proof that Raimi really did not understand the character of Spider-man.
Peter should never take off the mask while fighting villains, because when the mask is on, he's being Spider-man, not Peter Parker.
Raimi failed to realize an important staple of the Spider-man and Superhero mythos, that of an alternate identity.  When Peter had on the mask, he acted like, and essentially became a different person.  Spider-man was an outlet for Pete to let out all those repressed feelings and emotions he had kept inside him as a normal person.
Instead Raimi didn't make Spider-man an interesting character.  He had essentially the same attitude and personality as Peter, but wearing a mask.  Raimi actually considering adding additional scenes with an unmasked Spidey (the train scene was dumb enough) just goes to show how he really misunderstood Spider-man.  He did a good Peter Parker, but he really didn't do Spider-man justice.
And if anyone wants to try and say "it's too hard to convey emotion with an actor's face covered," my only response is, watch V for Vendetta, and try to say that again.
Okay, end of rant.