** spoiler alert ** 
 I wanted to like this. I devoured the other two and I was excited when it was finally time to read this. I downloaded it onto my NOOK shortly after midnight to start reading. 
 After finishing it and sleeping on it last night I can only give this book two stars. It was okay. That's all I can say. I can't even say that I LIKED the book. 
 What I DID like: Christina. Oh Christina, I want you to be my BFF. Christina is faced with so much pain and suffering and loses so much and yet she continues to be strong and positive. I wish that she had been a bit more integral during most of the story. 
 Tris. Tris continues to be both "Dauntless" and "Abnegation." While I didn't always agree with her, I had to remind myself that she was 16 years old, and most 16 year olds think they know it all. She continues to be the hero and voice of (mostly) reason. 
 What I didn't like: Tobias. I loved Four in the first book. The second book was a bit of a struggle but he pulled through at the end. This book... you would think that as much as he's been through he'd be less whiny and learn to trust both his and Tris' instincts more. And all we get in the way of an explanation is half way through the book, Amar tells Tris that Tobias can be "obsessive." 
 The entire Bureau plot. Seriously? After all this... We find out they are an EXPERIMENT?! And of course the head of the experiment is so out of touch he'll do anything to save the experiment because these are not PEOPLE they're just a means to an end. Nita and her GD's seemed a little out of place and just thrown in there to make sure the conflict went off. A little too predictable and contrived for me. 
 Evelyn. Of course I didn't like her, but her complete 180 at the end... well if it was that easy, why the hell didn't Tobias just have his little heart to heart with her in the beginning and save them all the trouble? 
 Which brings me to the ending... Tris' ultimate death. Yes. I feel cheated out of my happy ending. Another reviewer pointed out that revolutions and romance don't mix... but I would like to point out that in the Hunger Games, even though Katniss and Peeta didn't live happily ever after per se, they at least got to live out their lives together. Sure both were broken by the events of their shared past, but the point was they were able to support and heal each other as much as either could be. 
 Is Tobias going to spend the rest of his life trying to... what? Recover? Will he be able to move on? Likely I could see him and Christina eventually falling in love, and living much like Katniss and Peeta... comforting each other and trying to heal each other after all they had been through. Understandably, the author didn't put this in, I think it would have caused more of an uproar than the current ending. 
 I guess in the end, I can only say it was okay. I feel cheated. This is NOT the ending I signed up for, and I'm not ashamed to admit it. Yes, Tris dying for her brother was so TRIS, but I don't think Caleb learned anything from it. And what was the point if he didn't even realize what her sacrifice meant? Did anything really change? If she had lived, would the outcome have been the same? Most likely. So her death seems like it was more for shock value than anything. 
 A piece of advice I read in a writing book was don't break your readers trust. And that's what this book did. It broke my trust. I don't think I can read another of her books. I don't trust her to give me my happy ending that I desperately crave. And maybe that's okay for some. But it's not okay for me.