Rick Deckard is given an assignment to 'retire' several biologically engineered fugitives.
The plot follows Deckard as he hunts replicants, falls in love and questions his own humanity. It moves slow, allowing you to take in all the sights and sounds of 2019 Los Angeles (as imagined in 1982), whilst pondering some of its themes.
The imagery and dialogue associated with what defines a sentient being and what makes us human is compellingly portrayed. The device used to explore these themes is the genetically engineered humanoid life-form, the godlike status of its creator and the morally compromised nature of the ordinary human. Additionally the number of references to the eyes and linking of what we see and remember versus what is fake and reality, is cleverly mixed into the story. If you want in depth analysis, google 'Blade Runner Themes and Motifs'.
The character of Roy Batty has been interpreted as both a religious and philosophical allegory, but these theories are debatable. He is for me the most intriguing character in the movie and his final scene is one of the most memorable of all time. Along with Deckard, it made me wonder if there is any real difference between humans and replicants. He is portrayed wonderfully by Rutger Hauer who both looks and acts the part.
Deckard is impressively played by Harrison Ford, who is perfect for movies with an emphasis on visuals. Ninety percent of his power as an actor comes from his screen presence and soulful facial expressions. His scenes with Sean Young young are as touching as the action scenes are brutal.
One of Blade Runner's most memorable aspects is its depiction of 2019 Los Angeles, with its permanently dark rainy skies, overcrowding, neon lights, high concept technology, urban decay and environmental devastation. Take away the flying cars and off-world colonies and it's not far off an accurate prediction.
I could write about the atmospheric cinematography, artistic designs and special effects, but nothing I can say would do it justice.
The question of whether Deckard is replicant or human is interesting. There is evidence of both but you must watch and decide. Does it matter? Probably not. If I had to decide, I'd say replicant.
