This book is the result of Hogwarts and Narnia having a depressed, narcissistic, and all around fucked up love child. And I ADORED it. 
 Quentin is an asshole, he acts without thinking things through, and then when he does attempt to think before acting - it blows up in his face. He doesn't come out at the end of this book as a "changed man", if anything, he comes out as more of an asshole. I can personally resonate with this, as a semi-functioning 26 year old semi-bitch. Granted, not the extent of Quentin's asshole and general douche baggery, but I can resonate with some of his reactions to things. 
 On top of his general anti-heroness, the supporting cast is also a bunch of dicks. 
 A lot of people won't like this book - it isn't all puppies and rainbows. Fucked up shit happens, because guess what? Fucked up shit happens in real life. Sometimes the things that you desire most in the world, blow up catastrophically in your face...has that ever happened to you? I know its happened to me on more than one occasion. 
 Essentially: if you're a realist verging on pessimist, you'll most likely enjoy this book.