WakeUpWalMart.com, a union-funded campaign group, said the ad campaign proves Wal-Mart is seeing damage to its bottom line from a worsening reputation. The retailer had its worst holiday sales season in years, WakeUpWalMart.com spokesman Chris Kofinis said.
So did almost every other retailer in the US.

I know people who work for Wal Mart. They have no complaints with their jobs or their salaries/benefits. Compared to other retailers they are at least on par.

The truckers who drive for Wal Mart in many cases leave union jobs to work for them.

Wal Mart isn't perfect, but then again, no other company is, either.