3.5-ish 
 Look, there are some issues with this book, particularly regarding the minimal world building. 
 However, I enjoyed the hell out of it and really liked that it was unashamedly a YA dystopian romance. (So many try to pretend they're something else and it always annoys me.) 
 I also really liked the writing style which was borderline over-the-top, but worked for this story. It has a weird, uncontrolled rhythm to it that I read as intentional, as a metaphor for Juliette's condition. I could be completely off with this in terms of authorial intent, but that's the way it read to me. 
 Plus, it has an X-Men vibe and we all know about my love for that particular franchise. 
 I'm definitely reading the sequel soonish.