This film is not appreciated for its LEGEND
This Film deserves more respect and acknowledgement for its role in cinema history.
Okay, so its not the greatest Martial Arts film Ever. But it IS the film that introduced American audiences to these types of films.
Modern Audiences think it was Enter the Dragon(the same way they think Pong was the first video game. Completely wrong). Enter the Dragon was the first American Produced one.
For those curious about the history, there was a successful TV show called Kung-Fu with David Carradine. Some claim Bruce Lee came up with the idea, but that's false. He did audition and was turned down because they felt he was too much into action and not the storytelling. Kung Fu (TV Series) was really a Western but fused with Kung Fu philosophy. In fact, the protagonist always avoided fighting which was part of the allure of the character.
To Capitalize on its success, distributors started exporting over Martial Arts movies. Five Fingers of Death was the first and very successful. Many more followed and also were successful in Grindhouse type theaters.
US studios wanted to capitalize on it and Bruce Lee with Enter the Dragon was chosen. Lee(who was in the middle of Writing Directing and starring in Game Of Death) jumped at the opportunity and as everyone knows died shortly after Enter The Dragon was Finished(and before he could finish Game of Death).
So Five Fingers of Death isn't the greatest Kung Fu movie but its the First to be brought to America.