I try to be fair but seen with the rational mind of an adult this show is barely "meh".
The voice acting is absolutely overdone. Most of the villains are silly. Sound effects seem to come straight out of The Flintstones. Music between Pink Panther and Scooby Doo with a portion Peanuts.
Spider Man sounds like Adam West´s Batman, both in word as well as pronounciation and acts really dumb at times. "Oh, my spider sense is tickling" while someone stands right behind him.
Jamesson is completly possessed by Spider Man. Everything is Spider Mans fault, Spider Man is responsible - he sounds like a whiny child most of the time. That was my impression of the first season.
The Second season started with a great episode "The Origin of Spider Man" but that was a lone exception. In general 20 min episodes are just too long. They had too little content and oftentimes contain minutes of Spidey swinging around to some groovy soundtrack. It became increasingly more ridicolous, it felt like the writers were smoking weed. Elfes, demons, monsters or some kind of wild tribe, alltogether more sci-fi elements - it just doesn't fly.
Season 3 seems to be recycling old material with new dialogue.
For the intented audience that was probably under 10 I am sure none of this mattered. Unfortunately I don't have the fond memories of watching this as a child. I skipped some of the second season and the third just played with me paying no attention.
So I have to stick with "meh", sorry.