At least it was when I first saw it. I used to watch it religiously. Sadly, it hasn't held up. I mean, AT ALL! It's very dated. I still love certain episodes though, like the Hobgoblin ones. And it was very faithful to the comic books.
The X Men one was good too but how Wolvie managed to fight without ever killing anyone was a constant mystery.
I still think the Spider-Man cartoon you mention had it right overall. The ray guns instead of real guns were lame, and yeah some of it looks ropey now, but what a kid classic!
The latest Spider-Man cartoon is just Ben 10 in Spider-Man costume.