The plot starts off slow, and at some points it is predictable, but a couple of interesting twists, and faster paced dark turns of events save it from being too boring. At some points, things are unclear. Readers should know that this movie is dark, grim, and serious. The acting, especially the performance of Casey Affleck, is very good, but not perfect. The score is good, although after a while it becomes repetitive and monotonous.
This movie, while being a good movie, is slow starting, and very grim. It clearly lives up to its R rating, and is targeted mainly at adults. I would recommend this movie, but only to adults; your average, action-loving teen would most likely find this movie boring, and possibly disturbing.