I don't give it 5 stars because of the poor chroma key, but this is an absolutely gem I've always loved.
I'm pretty sure that this movie doesn't reflect what really happened in Colonia Dignidad, that it isn't as faithfully as it should be but I see it as "Titanic": we use a major issue to tell a beautiful love story. And, well, I like it.
Now, I have to say that Emma Watson's and Daniel Brühl's performances are such a wonderful thing to enjoy. They were very good, with an incredible chemistry. It's something quite normal in Daniel, but Emma is still growing as an actress and, without a doubt, I affirm that Colonia is her best movie yet.