Wolf04 said:
The book Blade Runner was based on, Do Androids Dream of Electric Sheep? by Philip K. Dick was infinitely better but that's usually the case.
I dispute this actually, and I am a serious Dickhead (as many people will tell you here

.
Films and books are different. They cannot be the same, and I don't think they can even be compared in this way. Ridley Scott took the basic themes and the plot of Dick's book and made something new which works on its own as a thing, and actually does not need to justify itself in comparison to the book. That's how all good adaptations should be.
It would have been very difficult to replicate the ironic dark and absurd humour that absolutely permeates
Do Androids Dream of Electric Sheep, in the same way that you couldn't have had the rambling interior monologues from
A Scanner Darkly in the film version (or not without making it seriously tedious). Instead, in the latter Linklater uses visual cues to indicate the breakdown of Arctor's mind in the film of ASD, and in the former, Scott updates the setting of DADoES, which was largely suburban, helping to define the urban imagery of cyberpunk in the process. And if for nothing else, Blade Runner is a classic for its imagery, drawing on things as diverse as the factories in Stockton, contemporary Tokyo and early expressionist SF films like Metropolis, but creating an entirely fresh dystopia...