Is Walmart an Empire of such collosus evil that Darth Vader himself cowers in its presence?

Seriously, the epitome of human exploitation, consumer culture has come to make Walmart your new God. Do you think they are a nasty, vile, creature of capitalism, ruining any and all small business, the kind of creature that likes to train a culture of people to bow down and buy its goods, or do they have a legitimate place in society?