Split Second
Rugter Hauer and Kim Catrall
http://www.imdb.com/title/tt0105459/
I have no idea who the IMDB reviewers were, or what they are smoking, but the movie they reviewed as a "passable B movie", and "great sci-fi horror cult classic" was not the film I saw. The year after high school in '92 a bud and I actualy managed to catch this film in theaters.
There was some kind of problem with the movie and they switched directors about halfway through, all the action and the attitudes of the actors just changes abruptly from post-modern, sci-fi film-noir tension, to a self-depreciating campy style. I think it's because they realized the film was an utter cr@pfest, and needed to try an pass it off as campy horror, as if that's what they were going for all along.
The action takes place in a mid 2000's London flooded by global warming, and the Bobbies are now all heavily armed, and splash around the city in jacked up 4x4 Jeeps. The flooding and general modern decay has turned London into a cross between Venice, and "Escape From New York". Rugter Hauer is the sterotypical "loose cannon" detective. There's a string of Satanic murders, but the murder must have super-human abilities to get in and out of where they happened, and do things like string bodies up on the celings etc.
Well, the monster is a 99.9999% rip-off of H.R. Gieger's Alien and is supposed to be some sort of Rat-Man-Satan fusion/mutation caused by global warming and the flooding of London. Kim Cattral shows up partway through as Rugter's ex-girlfriend somehow.
The only notable thing is that it's the only time I've ever seen "short-barreled, belt-fed, multi-barrled, gatling style, assult shotguns" used on screen.