This was made a while ago, and it is still relevant. It’s about the experience OF gaming, not the kind you get FROM the game. It’s a doco about the PEOPLE who game, and not about the game itself, though it does have some very interesting bits and pieces throughout it. It’s got some sound issues, but overall is a great watch if you are interested in understanding a bit more about RPG Tabletop gamers.
Of course, if you REALLY want to know more, then find someone to go get into a game of D&D with and experience it yourself…