I've always been a fan of this film and after coming across this review by Matt Zoller Seitz I had to post it here too. I agree with Matt that the film is a classic. The photography and the editing all point to a well crafted and interesting film. It's a film that should be viewed again, and appreciated.
Matt does a fine piece of cinema appreciation, and I agree with him on the films merits. Sharky's Machine feels like a simple exploitation type film, but it has deeper roots then that. Maybe that's why I like it. I was surprised it did moderately at the box office, but then again the beauty of DVD is that people can re-discover hidden classics, and that's what Sharky's Machine is a hidden classic.