Insurgent was such a great read, and even better if you don't compare it with Divergent. Book 1 was SO incredible, that it will be near impossible for the sequels to ever come close to its caliber. Insurgent came as close as possible, though. Very well written, with a smooth transition between books. 
 I wanted quickly to discuss and refute some of the "beefs" I've heard from fellow readers. There are a lot of character changes from book 1, which seemed to create a lot of friction from fans. 
 First, is Tris, who is suddenly not so tough, and showing a little too much fear for the likes of some. But answer me this... would you be able to respect a heroine who wasn't a little traumatized after being forced to murder her friend? She begins to feel doubt and fear, and I can appreciate that about her character. It makes her more human. 
 Second, is Four/Tobias. Throughout the first book, Four was constantly pushing Tris to her limit, making her stronger. Now, he is constantly holding her back. And giving her ultimatums? What the Hell is that about?! Anyway, I know that Roth has dabbled with writing scenes from Four's perspective, and I would LOVE to hear a little about what's going through his head in this book. 
 Overall, I loved it. Plain and simple. And now the long wait for book three begins...