i think that the Spawn cartoon owed its quality to the fact that the stories were being put together by people with a little bit of experience and some writing ability telling the stories while Spawn the comic was being put together by Todd Mcfarlane.
that being said, my 14 year old self loved the first 20 issues or so of Spawn where things seemed really new and exciting and anything could happen. after those 20 issues or so it became obvious that that wasn't the case.