For me it was the third book by John Green, which I read and it captivated me from the first moment and never let go. The figures are very similar to those in "Looking for Alaska", which I also liked, where my entry but something was difficult. This was not so in "Paper Towns", already the first page was exciting and worth reading and I just wanted more of it.
Maybe I can find the book so awesome because so many philosophical elements to be included, just the completely different interpretations of Whitman's poem whose lines I always had to read over and over again, because they have touched me so. The book saves not with quotes that have sentimental value, just some metaphors, of which a book can never have enough ;-)
Some readers of the Book did not like, I have seen among others the reason that Margo was always them unsympathetic. I can not confirm absolutely. If you read carefully, then all her reactions are completely understandable and I think it is up at the end of the book every self, "which Margo" is the "real", as it remains open basically. For me it is clear, but there are definitely some room and I can quite imagine that others have a completely different view to her character than I am. And that's fine, because I think that that was precisely John Greens intention.
Because the book teaches us just that we should not follow all conventions (which has me already very much at TFIOS among others), but we own opinion and should not simply accept everything.
"I'm a big believer in random capitalization. The rules of capitalization are so unfair to words in the middle."
Compared to John Greens "The Fault in our Stars" it made me not so convinced because it was something partly far away from reality, but on the other hand one can not compare these two works, as they are thematically quite different. "Paper Towns" is nevertheless worth all 5 stars, especially since I would give "TFIOS" a lot more if I could: -D
Conclusion: A successful book for everyone, as long as you can get involved in a few inconsistencies, but do the magic of the novel no harm. It has definitely re-read value!