While I appreciated the twist, I was very underwhelmed by this series. For me, it had no heart, no real interesting or likeable characters* and seemed to just be a string of conspiracies that increasingly became confusing and implausible.
*Now when I say likable, I should really mean charismatic. Alex DeLarge is in no way likeable but he oozes charisma. Couldn't say the same for any character in the Divergent books.