I was looking for more of a documentary on Calvin & Hobbes, and less of a fanfilm about how awesome it is. I already know that!
The parts of the film that are more documentary-like, like the scenes in the library with the copies of the original artwork, those are good and interesting. The scenes with other cartoonists discussing how they were influenced by Watterson, or discussing his influences, those are good to.
The rest of the film is just random people talking about how good Calvin & Hobbes is. Not worth seeing.