I've seen this movie, but I can't call it the best I've ever seen. The topic was important and the way they showed Derek's change was great. But I have to admit I watched this movie only cause of Edward Norton, of of the best IMO and one of my fav actors.
There were few really brutal scenes in the movie, but I had to expect that watching movie about nazists. So closing my eyes from time to time didn't help me to watch it very carefully.