Stanley Kubrick: A Life in Pictures (2001)
He changed film. I’m not going to list his credits but many great films.
Bonus point for being a true story puts this as a 4 or 5 but the detail and quality of the films he produced leads this to an easy 5 star documentary.
“Tom Cruise narrates this penetrating documentary, which explores the many and varied aspects of Stanley Kubrick: film director, producer, writer, photographer, husband and father. Check Out Stanley Kubrick: A Life in Pictures on Hulu.”
( http://www.hulu.com/watch/724215 )