It is one of those movies (the reviews for it were pretty mixed).I still can't understand why people thought In a Scanner Darkly was such a great flick.
I love it because I'm a Philip K. Dick fan and I walked into the movie with a mental checklist of stuff which would not be in the movie because it was too weird or there was no way to do it right.
For example, like Frick's daydream about an officer that decides to not read him his rights and just shoot him in the face, or the thousand-eyed being that reads his sins throughout time, the scrambler suits were way too complex... c'mon, none of that stuff would never be in a movie! And the novel's final dedication? Too personal maybe.
But it was all in there. It's the most faithful adaption of a PKD work ever, and to boot it's actually just a very good film. The animation actually aids the story in emphasizing the shifting, collapsing, ersatz world of a PKD novel, and the performances are across-the-board appropriate, even Keanu Reeves as a subdued, disconnected individual. How does one of my favourite sci-fi movies wind up as a Reeves film? Well, that's how.
I'd also go so far as to say I like it a lot more than Blade Runner, the most famous and acclaimed (and to be fair, first) PKD adaption.