(Maybe 4.5 stars)

I really enjoyed this story. It was a little predictable, and the concept of the five factions wasn't the most original idea I'd ever heard, but I found the characters to be (mostly) believable and appealing (except for the ones who weren't meant to be), and Tris' journey through the training was interesting, entertaining and exciting.

I had a hard time accepting the animosity between members of different factions - it didn't seem to serve any real purpose and seemed rather artificial. I also felt the world-building fell short - not that I had any problem with what was presented, just that there wasn't nearly as much of it as I wished there were.

That being said, I was thoroughly entertained throughout the entire book and can't wait to read the next one (which I get to do in a couple of weeks, thanks to a friend who's getting an advance copy! yay!).