I once watched Jackie on a documentary mention how a specific audience likes his Hong Kong films and a specific audience likes his American films but they rarely overlap. I belong to the former group, and believe this movie is the perfect example why.
The story does not twist or turn much but does have a certain charm and separates itself from any average "beat anyone up" kung fu film - even if a few fights happen for the stupidest reasons. It's all about a group of soldiers put together to get rid of some pirates in nearby waters which is always in competition with the local police force for funding. But the film really entertains through the use of Jackie's stunts and gags. From cycling through the cramped streets of Hong Kong to grenade training in the police academy, you bound to sometimes be in a state of awe - or at least chuckle a few times.
It's amazing some of the stunts Jackie pulled off, including falling from a very high clocktower. If your interested in Jackie's films, or want a high quality kung-fu film then I recommend you have a look at 'Project A'.