Ok... so, somehow, seeing Spiderman running around on photos in real life looks ridiculous.
Having actual superheroes wouldn't work off screen.

 

http://www.onlocationvacations.com/2011/01/18/exclusive-fan-photo-of-spider-man-on-the-set-of-the-spider-man-reboot-in-l-a/

 

http://www.tmz.com/videos?autoplay=true&mediaKey=2094fb71-f89b-41af-88fb-4f35a54cc47f