From what I understand, this is a love or hate book. And even though I was clearly in the love group, I can see why some people wouldn't like it. 
 As far as YA books go, this one does tend to be a little violent. I mean, it wouldn't be believable if it didn't have a little gore, right? (Just take a look at Hunger Games) But through all the scenes with feet, fists and guns, not once is violence condoned. You have to look past it to find the bigger picture. 
 I always love a good kickass female protagonist. She's strong. She's brave. And all without being annoying or whiny. The teen angst was at a bare minimum. The plot is intriguing and well written, and left open ended enough to have me dying to read Insurgent. 
 ... 
 Have I mentioned how much I hate waiting for sequels?