Gosh this book is awful.
It could have been half the length, for starters.
The teenage characters are very difficult to believe as teenagers... or as characters.
Margo is the most annoying character of any book I've ever read, ever.
The last chapter, where everything is "deep" and "insightful" is beyond boring and again, just not believable in any way.

I've read John Green's books before and actually enjoyed them. Either I've changed drastically over the last few years or this book is just... not good. Either way, this wasn't for me.