I did not love this book, but I liked it. It was entertaining and I got the same vibe from John Green as with The Fault In Our Stars (so far the only other book of his I've read). He has a peculiar way of writing his characters and a keen eye for detail, which I like. 
 The story itself, when looked at very closely, is not fast-paced or very suspenseful. The book seems to be more about developing and giving insight into the characters than about a great plot and sometimes I found the story to be a bit slow. I liked the fact that not all the characters are likable, although that sometimes got so bad that I actually got rather frustrated ((view spoiler)[ mainly when Q and his friends finally found Margo; the way she responded to them after everything they had been through to find her was incredibly selfish and bitchy (hide spoiler)]). 
 The entire book is basically Green taking the reader along on the journey Q makes. That is not just the literal journey, but also the journey he goes through personality-wise as he struggles to decipher Margo's clues in order to find her; he grows a lot during the story. In my opinion, Paper Towns is nice - not incredibly great, but a nice read nonetheless.