Driving through DE , Golden Corral had a lunch buffet including burgers for $12. All Star resort burger starts at $12.I don't think the food at WDW is terrible or worse than Golden Corral/McDonald's (it's also much better than the food I had in the parks at Universal, which was abysmal and actually much worse than fast food), but I think it's wildly overpriced for the quality (with a few exceptions).
Obviously some (most?) of the price inflation is because you're at Disney -- it's not like Universal's food is any cheaper -- but I can eat much better food at similar (if not cheaper) prices here in Atlanta.