This "takedown" of Barbera Ehrenreich is total bullshit.
Condensed (read the comments) :
Charles Platt : I worked at Walmart and it wasn't too bad.
Commentators : But you didn't try to live off your salary; which was kind of the point of the Ehrenreich book.
Platt : Ah, but she was stupid / selfish to hope to actually live off her salary. Obviously she should have subsidized Walmart's profits by doubling up and sharing her accomodation and bills with other people.
Er ... right.
There's more if you can stand it. Boing Boing commentators pick up most of the egregious stuff.
Update: Gave me an idea though.