'A Scanner Darkly' is supposed to be set in the 1990's but apart from some fancy police equipment and some Planet of the Apes sequels it's just the 1960's and everyone speaks like they're in a Cheech and Chong movie.
 Remember when you'd show up late to a party and all your friends were stoned or drunk and having what they thought was a very profound conversation but you were sober so it was just annoying nonsense. That's 98% of this book! 
 The plot doesn't really get going until about chapter twelve and then it ends just as it seems like something might actually happen. For most of the book there isn't really a plot, it's just some stoners talking crap and none of the characters have enough depth or character development for me to actually care what happens to them.
 The big reveal at the end could be used to ask some interesting questions about society, but it's not because that's the end and I sat through a whole lot of boring nothing to get there!