I know this is a pretty late review but I totally agree with Beatriz Abreu's comment.
There was so much more background information in the movie that was missing! They made it seem like Al's suicide was JUST because he was going to fail Dauntless. I mean, it was mentioned like one time that he was going to fall out of Dauntless anyways, but he did it because of what happened when they tried to push Tris into the Chasm.
Shauna, Lynn, Hector, Marlene, Uriah, Zeke, and Drew weren't even in the movie. Edward wasn't even mentioned, though his name was on the ranks. But Edward played a big role in the movie with getting his eve stabbed...
Looking at it from the POV that I hadn't read the books yet and just wached the movie, it would be OK...but the plot is still pretty predictable.
*Sigh* It could be better. Would not reccommend. NEVER read the book and then watch the movie, the book is always better.