What bothered me the most was the scene in the Control Room toward the end. Having everyone under the sun there instead of just Four takes away the whole tension between Four and the Candor faction in the second book, plus is just didn't make sense.
Exactly! Sometimes they manage to make a good movie out of a book, but then sometimes I just have to shake my head in disappointment when I see a movie where the book is awesome and the movie is... not.
I agree with all of your frustrations, as I felt them too. Mostly I didn't believe Shalene as a strong heroine. She is not at all the Tris that is in the books and that ruined it for me.