Some have cited Toei not using any established villains from the comics as wasted potential as well.
Visual Effects of Awesome: Yes, there's a lot of cheese, but the Spider-Man suit is pretty good, especially when you consider how bad the suit in the American television show looked one year before.
What Do You Mean, It's for Kids?: While it does work almost note-for-note like a typical Super Sentai series, Spider-Man contains some rather impressive violence for its time. There's blatant murder in the show (see Crying Wolf on the main page), shots of civilians being killed on-screen are commonplace, and one particular scene (used in the official YouTube trailer by MARVEL, no less) where a cat gets sliced in half with a katana. While it is true that there is very little or no blood in the show to speak of, the amount of violence in the show would be rather unsettling for modern child and pre-teen viewers. However, the way they show the cat (which was, to be fair, a murderous cat demon) being sliced in half is by freezing the frame on the cat and having the image split apart on screen. Also notable is the fact that about halfway through, the episodes get noticeablylighter and focus more on Spider-Man helping out kids and less on the somewhat unnerving brutality of the earlier episodes.