The plot is interesting enough, after an unspecified time of conflict, people in Chicago have placed themselves in different factions in order to reduce conflict. When their children reach a certain age, they test for what faction is more suited to their personality, but can choose to ignore it. The whole idea seems a little strange at first but I didn't have a issue with it as I could see the reasoning.
Beatrice Prior is a member of Abnegation, a bunch of selfless types who help everyone and run the Government. She doesn't really like being selfless to the point of idiocy and when her test proves inconclusive, a fact she has to hide, she transfers to a bunch of batty combat jocks called Dauntless and changes her name to Tris. She is an fascinating character and does change over the course of the book. Of course as this is YA dystopia, Tris is the special snowflake who has powers but they were dealt with in an interesting fashion.
Secondary characters are quite well drawn, despite the first person perspective and the action was well written.
I didn't really have any 'eye-roll' moments, which have happened in other YA books in the and I was drawn into Tris' world.