Most of the commentary and interviews were taken from one group of gamers and their particular DM. Some of the more "unusual" habits (like marrying off every one of your characters, writing up the sheet for their wife, then making dominent and recessive genes for every stat) are paritcular to that group and feel like it shouldn't have been given as much time as it was. There were other partions of the documentary that also had me scratching my head going, "That isn't right...". I also felt that the history of the game wasn't given enough development compared too the other aspects of the game.
Either way, I definatly feel this is one of the most accurate sources for information on D&D for the unitiaited. I'd give it a 9.9/10.