More human than human...
I guess I must have caught it on TV or video originally. It was quite a black and white story at that age. Bad guy robots tracked down by the good guy detective and the woman robot who changed sides. It's funny how age and experience gives you a deeper insight into these things. As time passed I saw more of what I missed. The black and white became this strangely amoral grey. The robots are like us. They want to live. They make the same moral choices (bad ones) as humans can, but they aren't inherently bad. And then their was the debate about Deckard's true identity. Is he a replicant or not? Ridley Scott says yes, I say leave us questioning. It's an amazing looking film and I love both versions (after years of the director's cut I find the original edition's narration not as annoying.) Rutger Hauer's career best role as Roy Batty must also be praised as he delivers his final monologue cum eulogy and expires before us all.
As I postscript I must comment on the source material. The original Philip K. Dick novel is awful. He really must have been on one of his drugs benders. It's just utter rubbish. I recommend Future Noir: The Making of Blade Runner, to anyone interested in reading more about the genesis of this genuine science-fiction classic.