A former humanities professor turned brand name fright-master, producer, writer, director Craven is clearly an intellectual artist trapped in a disreputable genre. He entered filmmaking as an editor and assistant producer to exploitation producer Sean Cunningham (who would later create Jason for the "Friday the 13th" movies) on several low-budget comedies and skin flicks before graduating to the position of writer-director with a modestly budgeted ($87,000), feature "Last House on the Left" (1972). Still a potent shocker, this grimly realistic tale of rape, murder, and revenge was loosely