Great film that seem to be almost a "classic" of action-comedy genre.
Almost?
For me, Sammo is the creator' genre in his most cynical form.
Yes, he has exploded the rules and made his owns mixed bags.
Comedy,action but also sex or politics or whatever treatments or thoughts are modernized and the bidding is open for the next movies to come(more comedy, more action, more violence, more, more, more...).
Jackie Chan enforced the cast and give the action a real interest, emphasizing Sammo'skills too.Oh, and he has a cross with Biao in the street...And let's say this guy,named 7086(!)is a little bit in over-reaction in his decisions.
Each characters has their own stories and it make them very humans and not secondaries in the movie.Brotherhood has a precise description that Sammo himself describes("As long as they are my friends,I don't mind them bullying me...).
They are the "Lucky Stars" from the cleaning company name they work for.
They have to fight the Tien gang but also go at his party...

With this title, Sammo Hung could open a branch of his versatile director'works
and thanks to him to have led the "politically incorrect" style on screen.
So yes, it's not elegant for women and farty humor is at a ground level but it gave us some incredibles films that only HK and Sammo could produce.
Oh, and by the way, i'm a Sammo'fan ;-)