:( 
 There's nothing wrong with the writing in a technical sense...it's easy to read, engaging, and moves along at a nice pace. But...the WORLD! The premise of the world on which the whole plot hangs is completely ridiculous. So while a part of me can empathize with each character's struggles, a big part of me remains pissed off that these kids have to be in these situations in the first place, because it makes no sense. 
 So what if there was a massive war or whatever? No group of people is ever going to sit down and decide that there can only be 5 personality traits that will solve all humanity's problems, segregate themselves, and then restrict themselves from exploring options outside of their assigned trait. 
 Not even idiots can possibly think that a person is deviant or "divergent" if they happen to have multiple good characteristics. Smart AND selfless? For shame! Brave AND Smart AND honest? God, no!! The aptitude test (aka "sorting hat") is stupid and simplistic beyond belief. Individual characters in the story bring up the fact that true bravery could also be standing up for what you believe in rather than extreme physical acts, but that only emphasizes how stupid this story's reality is, that the society's founding members and all its population don't ask these same questions themselves. 
 If you have the ability to swallow disbelief, then go ahead and read, because this book is pretty enjoyable otherwise. But if you're the type of require plausibility, then stay away!