Some months back while perusing Youtube, I came across this series of segments from a documentary film made about D&D some years back.
It is very informative about the game, and is certainly a fan effort, though the student film making is very good.
It only briefly addresses the anti-D&D sentiments that affected the hobby in the 1980's. It mainly interviews players, films some games, relates the history of the game, and showcases some truly amazing artistic creations by players.
If you want to know more about D&D and D&D players, it's a very good place to start.
Be advised, though, that the subjects of the film are some of the rarer sorts, that is, groups that go in for a very immersing style of play and involvement. Their honesty and transparency is refreshing, but the vast majority of gamers you might join at a table usually provide much lighter fare and do not speak in strange voices and play by candle light--much to the detriment of the hobby! Our gaming group here in my town only minimally resembles the film's participants, but we have still have a great time!