I found this one really boring compared to Red Queen. I think the plot just moved along too slowly.
I also got confused a time or two when I misread a sentence because it wasn't immediately clear that Aveyard was referring to a character's ability. For example a sentence like "She saw two eyes" not referring to the body part, but to people who have the ability to see into the future. I think Aveyard should have capitalized those words (Eyes, Silks, Strongarms, etc.) to make it more clear and reading more smooth.
Also, in my review for The Hunger Games , I mentioned the belief Aveyard and Collins share that one cannot scream without a tongue. Sara (who was supposedly "unable to scream in fear") still has perfectly good vocal chords. She can still make noise through her mouth. She can't shape that noise into understandable words because of her lack of tongue, but she most certainly would be able to scream. The tongue has nothing to do with screaming.