I'll start by saying I'm a fan of John Green. I've read most of his books following the popularity of Fault In Our Stars and have enjoyed the movie adaptations. I can remember reading this book and not loving it -
Likely in comparison to some of his others. But for what is maybe not his strongest story, this movie is a really good adaptation. I think it captures the character of Aza really well, and then changes made to the storyline help move the film along for the better. I think the young cast have done a great job, and whilst this isn't the type of movie that will win any awards, all in all it's a very solid film.