Another discussion about best writers had the caveat "except for Stan Lee" because the answer is so obvious. But that ignores the discussion about why Stan Lee's work holds up so well, and why it's so damn good. You wouldn't have a similar discussion about Bill Finger's Batman, Jerry Siegel's Superman, or William Moulton Marston's work on Wonder Woman.

A few things to start with...

1. The Artists: When you have Steve Ditko and John Romita Sr doing character designs, and choreographing action sequences, you have a head-start on everyone else.

2. Peter Parker and the supporting cast: This series had more focus on the superhero's ordinary identity than any other, exploring his home life, his experiences at school, as well as one of the most interesting places to work in the comics in the Daily Bugle. There would be a viable series even if Peter Parker wasn't Spider-Man.

3. Clever quips- Stan Lee has a hell of a voice as a writer, and it's hard to match for the solid quips per page ratio. That makes the superhero stuff consistently fun to read

4. Experiments- Stan Lee would devote the majority of an issue to the aftermath of a battle (Amazing Spider-Man #27/ 33), deal with the consequences of previous stories (When Spider-Man lost his memory in Amazing Spider-Man #55, he didn't get it back until several issues later; when Doc Ock destroyed part of his home, he worried the next issue about how the insurance can take care of it) or try to tell feature-length stories that would now be graphic novels (Amazing Spider-Man Annual #1 with the Sinister Six, Spectacular Spider-Man #1-2.) He didn't limit himself to one kind of story.

5. No Respect- Peter being Spider-Man screwed up his private life, but he didn't even find comfort as Spider-Man because the public was often against him. That's a consistently interesting dynamic.

There's a lot more you could come up with, but what say you.