The common denominator in all of Dick’s fiction is a world beset by an unconstrained and monstrous entropy that devours matter and even time
Reference: https://dynamicsubspace.net/2010/05/09/stanislaw-lems-philip...
And also from the linked article:
The writings of Philip Dick have deserved a better fate than that to which they were destined by their birthplace. If they are neither of uniform quality nor fully realized...
Unlike Stephen King, Dick's books aren't very easy to read from cover to cover, but they're filled with rich references of dystopian tragedy.
William Gibson's Neuromancer is a little easier, but leans more stylistic similar to A Clockwork Orange by Anthony Burgess, who relied on a Russian-influenced argot called "Nadsat", which takes its name from the Russian suffix that is equivalent to '-teen' in English to inject the character's language with a certain brand of nastiness to go with the subverted plot.
Stanley Kubrick successfully adapted King's The Shining and Clockwork Orange, but failed to wrap his mind fully around Dick, methinks, as he could never bring a Dick-influenced project to its feet, A.I., which Spielberg couldn't do much with either.
Part of the adventure in reading Dick is figuring out what the hell happened before the novel began to have such a devastating effect on the present he so vividly presents.
Since he died, the imaginative powers of Dick have been tapped and retapped by Hollywood, (Bladerunner, Blade Runner 2049, The Man in the High Castle, A Scanner Darkly, Minority Report, Total Recall, The Adjustment Bureau, Screamers) ...and sometimes the results are even pretty good (despite the esoteric nature of his writing).
There's a lot to be learned about our existential existence from reading Dick, and I associate him more with Kafka and Camus, than his science fiction genre-mates.
Don't forget The Matrix -- though it wasn't directly based on any of PKD's work, his influence on it is pretty clear. The Truman Show was obviously inspired by Dick's Time Ouf of Joint (though Dick's book was a lot darker than the lighthearted Jim Carrey comedy). Eternal Sunshine of the Spotless Mind is yet another PKD-lite (featuring Jim Carrey yet again). PKD's influence on Hollywood is vast.