A Hong Kong-based crime movie used to be a reliable way to spend ninety minutes or so lost in fast-paced action. But this one is kind of slow and stodgy. About 5 minutes in, I was thinking: these guys are the worst shots in the world. Because a remarkable number of bullets are fired without effect, even at seemingly point blank range.
The movie also wants to engage in a bit of social commentary, as the higher-ups in the police department want to recover from some embarrassing behavior of officers in the initial shootout. This isn't very interesting.
For film buffs, the first seven minutes is a single tracking shot, with a dolly zooming up and down, in and around the action. That's interesting, but I think I would have preferred to just watch Touch of Evil again.