As a life-long Detroit area resident, I'm always interested to note how the loudest cheerleaders for the benighted hellhole are those who wouldn't actually be caught dead living withing the city's borders. For these scolds who perch in their safe suburban homes, documentaries like Detropia allow them to scratch their itch to preen their civic-mindedness.
A loose amalgam of overly arty lo-fi footage and interviews with people scraping by in the ruins, there are very few insights to be garnered other than outgoing Mayor Dave Bing's observation that as soon as anyone gets the scratch up to get out of town, they do. Looking at the ruins and watching a UAW Local President musing about past glories while seeking scapegoats for the ruination of the auto industry is old hat to a local, but there's little here for outsiders to learn from.
Shortly after watching this, Anthony Bourdain aired an episode of his Parts Unknown series which was far more enlightening. Hunt that one down instead.
Score: 5/10. Skip it.