Robert Greenwald's latest documentary, "Wal-Mart: The High Cost of Low Price," feels like a rushed, poorly edited film. That is understandable, considering the director assembled more than 800 "field producers" who, in a few months, fanned the country and also headed to Wal-Mart factories in Bangladesh, China and Honduras to collect stories of how the nation's largest retailer is undermining the American quality of life. He spliced dozens of those stories together, many with poor sound quality or shaky footage. But the voices of current and former Wal-Mart sales associates and managers bring to life the way that corporate dominance...