I think of this documentary the way I think of the Peanuts cartoon specials and comic strips - it's consistently good but not often great. This documentary apparently had access to all of Charles Schulz's personal materials, as well as the wealth of specials and publications out there, so they've definitely put together an impressive documentary where you will learn a lot about the world of Charles Schulz. The documentary definitely focuses a lot on interviews of his associates and childhood friends, which is interesting but I think lingers on a bit too long. I would rather the documentary had delved a bit more into Schulz's home life, work habits and just "what made him tick."
I also would have loved to see more of his personal work, as I'm sure he had unfinished and unpublished material - as well as some more non- Peanuts related stuff?