Despite getting slated as a cash-in on Bruce Lee's legacy, this isn't that bad a martial arts film. Despite getting top billing, Bruce's character gets killed half way through the film, leaving Tong Lung, the "irresponsable brother" to seek revenge.
The second half of the film, without Bruce's out-takes, is more coherent, and builds to a decent climax.
The fights are actually pretty good overall, especially the final confrontation between Tong Lung and Hwang Jang Lee, a Korean fighter who regularly turns up in Martial Arts films as the "baddie" (Drunken Master, for example), and is a superb fighter.
Not as good as a proper Bruce Lee film, it nevertheless remains a good watch.