If you are interested in life in Rio's favelas then your first stop should be City of God followed by this excellent film by the same writer. The narrative, the characters, the music, the cinematography, the dialogue, the directing, tension, pacing and overall look are all five star amazing. We see and feel the large amounts of blood sweat and tears.
The controversy about the film showing a fascist view of the police force is unavoidable. However, In a city that is overpopulated with poor, desperate people armed to the teeth with a unlimited supply of guns and there is so much drugs and crime, of course there will be fascism amongst the police force. They are going to be aggressive, they are going to shoot first when the people they are arresting are armed to the teeth. There are scenes of torture interrogations, bribe taking and tampering with evidence. I don't think the film condones the fascist actions but instead shows that this is the way life in the favelas happens. I think the film was trying to show an accurate reflection of the police in the favelas rather than saying what they were doing was right or wrong. The only problem people may have with the film is its politics and themes as on a technical and performance level it is magnificent.