But be warned that there's a lot you may find off-putting.
(1) The film quality is the worst I've ever seen. At least the sound was good.
(2) Of course, the West Indian accent is difficult to penetrate. After a few minutes, your ear should become accustomed to it, and you probably will understand what people are saying, but if you have difficulty with accents you may never know what is going on.
(3) Apart from an interview with Harry Belafonte (which is very enlightening and increased my respect for the man), the entire film is inward-looking. Every now and again, someone says that the calypsoists are the heirs to the griots, and you can sometimes get a West African "feel" to the performances, but this wider context is otherwise ignored.
(4) At the same time, viewers would probably welcome a little more social or political context to the songs. That would have to go further than than the film's regular shots of bars, shanties and peeling wallpaper.
I gave the film a 7, based solely on the music and the people.