I just didn't understand the hype for this one. 
 I have a feeling that this is one of those books that if I had read before reading any reviews, I would have given it a better rating. I'd been seeing this book get nothing but glowing reviews from people on Goodreads, so my expectations were pretty high and I had been looking forward to it for a while. Unfortunately though, my wait just seemed to end with nothing but disappointment. 
 I'll start with the positives, since this book really isn't completely terrible. I really enjoyed the overall concept, kids with powers, hitler style concentration camps, camp breakouts, different classes of powers. The whole thing felt very dystopian meets X-Men, and in the beginning I was kind of enjoying it...but then the middle came. 
 Now the middle of this book is basically our cast of characters searching for somewhere, which leads to lots of meandering exposition. I stuck with it because reviews had mentioned that the last 100 pages were brilliant, but while I thought they were better than what came before, they weren't good or interesting enough (for me) to save the book from a two 'it was okay' star rating. I was torn enough to ALMOST give it a three, but then I realised I have very little intention of picking up the sequel, so I can't really say I liked it. 
 It was the characters that were the biggest letdown here. I've read enough YA now that a book really can just die without an interesting main or side character to draw me in, and this book just didn't deliver on that. I'd even go as far as to say that I found the main character, Ruby, kind of annoying. I found her to be weak, and without a backbone, always doubting herself when she was one of the more powerful (let's call them) mutants about. The side characters then, while less annoying, were just a little bland, and I didn't get attached to them. It also took me about two weeks to finish this book, which is unusual for me as I tend to fly through things pretty fast, but this just proves that it was lacking that 'hook'. 
 Now it's easy to focus on the bad points when writing a review, so I'd like to point out that this book really isn't that terrible. The writing is generally really good, and I can even see why people enjoy it. I also seem to be one of the few people who didn't love this, so I'm just going to go ahead and call this a 'it's me, not you' book. I was disappointed, but you might not be, we will just leave it at that.