11. Wal-Mart ( WMT ) Walmart, the world's largest retailer and private employer, is also one of the most polarizing companies when it comes to public opinion. The retail giant is infamous for undercutting prices and hurting, if not dooming, locally owned businesses. While Walmart touts itself as a job creator in small towns across the country, it pays its employees very little. Based on self-reported earnings listed on Glassdoor, cashiers and sales associates have an average starting wage of less than $10 an hour, which is not enough to maintain a normal standard of living in many parts of the country. In addition to hurting mom-and-pop operations, Walmart is also disappointing its customers. According to a recent Zogby survey, roughly 40% of Walmart customers polled reported a negative customer service experience. 12. Charter Communications ( CHTR ) Charter has one of the poorest reputations for customer service of any company in the subscription television service industry.