Spider-Man certainly can make for spectacular movies on the big screen when done right, but I feel they could do more with the Spider-Man mythos in a TV show. They could adapt decades of Spider-Man stories from the comics (not straight adaptations, though) and introduce a greater variety of villains and supporting characters. It could last for years. What do you think?
Personally, if such a show was made and lasted long enough, I'd want a few seasons dedicated to the Superior Spider-Man storyline. I really want that storyline adapted either to the big screen or the small one, but movies based on it are much less likely.