Originally Posted by Agent Orange
Raimi had a similar philosophy and despite the critical and commercial success of Spider-Man 2 he took some criticism for tossing Spidey's mask aside whenever he could. He felt that the audience would relate better to the character's plight if the audience could see Tobey's face as much as possible.
That makes more sense considering the Spider-Man mask completely obscures an actor's face altogether to the point where anyone could be under that mask because it hides everything.
Batman's mask shows the eyes and lower half of the face of the actor. You still get to see the man in the costume. Not the case with Spider-Man. The mask hides all emotion. That's why Raimi had the mask come off at every opportunity.