I've seen a lot of reviews critiquing the book, saying it was too flat, that it was a disappointment, yadayadaya. But for me, I personally found it very very worth my time. I was one of those people who kind of understood the silence of the people during the Holocaust and them not speaking out but I also believed that such a thing couldn't happen again and that times had changed. Reading this book showed me how dead wrong I was. Even if the leader might not intend for the movement to get super serious, the followers can make it do without realising either.

However, I do kind of agree on the part of the characters being flat. A part of me wishes we got to know more about the students, at least the main ones, besides "Oh here's your typical jock who's a bully and whose brain is only filled with football. Watch him become brainwashed by this experiment." But the same time, I understand that the book isn't fictional (i.e. it's based on something that actually happened irl) and that they had to make the book short and succint but detailed enough to get the point across to many people really quickly.

All in all, it's an awesome book and I'd recommend it to others.