At the expense of sounding a bit cliché, it wasn't on par with the best of the genre (Such as John Woo's better films), and in my opinion it wasn't quite on par with a more closely related title, The Big Heat. Why? The constant music was nothing special, and at it's worst, slightly annoying.
There are a few somewhat wooden performances. Tony Leung Chiu Wai was far better in Hard Boiled. I don't think Tat-Chi Yau knew how to wring all of the potential Tony has out of him for this film, and it shows.
There was a certain dynamic that's almost a staple of the HK action/crime genre missing... The power of the weapons wasn't conveyed as I've seen it numerous films over the years. What I mean is that the guns didn't truly seem as powerful as they should of. The shots, underpowered, and it's a bit underwhelming when I'm used to even pistols coming across as these loud, near deafening, definitive things. Small thing but it ran through the entire film and I think it's worth mentioning.
Could of been about 20 minutes longer, with more characters being fleshed out a bit more. Film could of benefited a lot from that.
Bad subtitles. Quite a few misspelled words and I'm sure I missed the gist of multiple things because of the poor subs. Ah well.
Those are all relatively small issues I had with though, and on the flip side it's got a lot more positive things going for it. A great build-up of suspense at multiple times through the film, a pretty complex interweaving plot, two very interesting, I might dare say original action scenes which made me grin...
To boot, it was brutal and uncompromising. No humor (Though the random, unexplained vomiting kind of teetered on it) A few nice, brutal for this kind of film scenes that pleased the inner gore hound in me. The coloring throughout the film, as mentioned by others, was nice and added a nice dynamic to the film.
Hehhehehee, the movie also stars, without a doubt, the most unrelentingly sweaty character in the history of film. Tony Leung literally wipes his face down with a towel every few moments for almost the entire film. Hey, it's the little things that I get a kick out of. He kept washing his hands and what not too. I think he had some kind of sanitation issue.
Overall, a 7.5 out of 10 in my very personal opinion. Well worth hunting down and adding to your collection, as it's a very solid entry in a sadly still declining genre.