BLADE RUNNER is a well written and acted movie based on two novellas by author Phillip K. Dick which are good tales but this screenplay elevates the tales to great not just good. The set designs are innovative, add to the story and believability that this is a furturistic world where androids do exist and threaten humans. Ruger Hauer portrays a haunted villian chillingly and Harrison Ford as the relunctant hero sympathetically not only contributes to the continuity of the film; but also allows the audience to walk into the film and be a part of it not just obwerving the scenes.
That is why this film is my favorite still 25 years later.