I enjoy the commentary tracks on DVDs especially the ones that add back story to the movie. On the Dunken Master dvd it had commentary by Ric Meyers who has written books and in magazines in depth about Martial Arts. His insight into the character of Won Fei Hung, helped me understand and enjoy the movie more. Such as commenting that the Drunken Master was like a who's who of Won Fei Hung films which date back to the days of black & white. Or the fact that Simon Yuen who played the role of the old master died a few years after the movie was made but still was featured in several spinoff movies about his character even though they were not true sequels the studios still advertised it as such, i.e. 36 Crazy Fists and Manificient Butcher among others.
I like the documentary style of commentary over the getting the cast together to talk about nothing tracks.