Scorsese grew up amidst violence and bloodshed.  That he is able to reproduce murder and mayhem so realistically is an achievement that deserves one star.  The rest of the film, with its hookers, pimps, and contrived direction is really not worth mentioning.  A perfect example of intense violence mistaken for great artistic expression.  "Taxi Driver" is, quite simply, not nearly as good as "enlightened" cinephiles make it out to be.