Saw this when it first came out and thought it was arse. Given a second viewing, it turns out it's actually not a bad little spin on the whole vampire thing.
At some point in a pretend futureworld, humans have become the minority and most people have been 'turned', resulting in a vampire majority population. Including Ethan Hawke whose character is some doctor fellow who refuses to drink human blood as he's, like, some Guardian reading type who objects on moral grounds.
There's some nice touches like daytime cars that are completely blacked out and allow driving via externally mounted video cameras (like my Dad's Peugeot camper van has for reversing) and are fitted with U.V. detectors.
Anyway, humanity perseveres and the goodies win. End.