If you already read Insurgent, be prepared to be a bit disappointed with the level of organization and the change of direction of the movie, but the story line and plot was still not bad. If you haven't read the book (READ IT), I would recommend the movie, but watching Divergent would be a good idea, otherwise, you won't understand anything.
The acting was great, and featured Hollywood stars like Kate Winslet, Ray Stevenson and Octavia Spencer. Also, the character that Shailene Woodley portrays is nothing like Tris from the book. Overall, I was a bit disappointed with the change of the plot and the way Tris was shown in the movie. My rating out of ten, would be a 3.5-4. I would watch it for the first time, but probably not for the second.