It's not a documentary as such. It's sort of but not quite a character study. So what is 20,000 Days on Earth?
During the running time there's about half an hour of truly great footage, ranging from an eel-based lunch with hirsute Bad Seed Warren Ellis through all-to-brief car rides with Kylie Minogue, ex-band mate Blixa Bargeld and Ray Winstone (the Winstone conversation being the best and funniest of the three) to some excellent rehearsal and recording footage.
Richard Gere is the least gentlemanly gentleman ever called a gentleman in the title of a film. A gentleman wouldn't, generally, call a young lady a "cunt" I don't believe. Even if the young lady in question had done something bad.
The film is melodramatic hogwash, with Louis Gossett Jr's Oscar-winning performance as a tough drill sergeant the only saving grace.
Depending on which of the two types of martial arts movie plot you prefer (fighting your way through a tournament to avenge the death/injury of your friend/relative or learning a new martial arts technique from an old master to avenge the death/injury of your friend/relative) then either this or Kickboxer is Van Damme's best film. Although he should have won two best actor Oscars for Double Impact, obviously.