The highest rated of Jackie Chan's own movies at IMDB. He co-wrote/starred/directed but IMDB trivia claims there was at least one stunt he didn't do himself! It seems clear that secondary-squeeze/moll Brigitte Lin did at least some of hers but I have to wonder about the commitment of main squeeze Maggie Cheung: she's ridiculously young and one-dimensional here. I'd say her acting fell short of the exemplary standard set by Doyle in Comrades: Almost a Love Story.
The plot doesn't really hold together too well: everyone seems to know where to find the bad boys, Brigitte seems to know nothing, know too much and is too willing to return to her much older sugar daddy (Yuen Chor) despite him trying to bump her off after Chan's efforts to protect her. The computer printouts could, you know, be printed out again ... but then Chan would've needed to find some other excuse for his batshit climactic stunts. The early set piece at the shanty town on a hill was also just too much.
There's a lot to enjoy here. The best bits were the small touches like when the police mass to go take down the rogue Chan over many seconds of screen time and begin to depart ... only to scream to a halt, as if someone turned their electricity off, when he turns up at headquarters. His clowning is first rate. The making-of footage during the closing credits is excellent.
Vincent Canby in 1987, patronisingly.