I was ready to hate this, not being a fan of that style of music and initially it seemed that the doco was essentially glamorising criminals.
While they are indeed criminals, they are trying to better their situation and turn their lives around, and trying to give hope to their communities.
The style of music lyrically is somewhat controversial, and it's clear that Australian police don't get it. This doco has at least got cooperation and involvement from the police, but presents it in such a way that is in itself unfair - while the police's actions are undoubtedly heavy handed, it is not unfounded since they are dealing with criminals. Bringing the race argument into the discussion also seems unnecessary, and just distracts from the narrative.
In the end, it's a compelling story, told well but mostly from one perspective. You can feel a real empathy with the group members, and really hope for them to succeed, whether you like their music or message.