I think you encapsulated the problems with some of those questions there Scott. When you hear the first question, you're not keying on "Overall", you're keying on what the standard of living for your age category is compared to the same category a few years ago. After all, it's a survey question; it's not like it's a certification test where you're actively looking for those qualifiers.
With the exploitation question, it comes down to perspective. The foreign worker working in (to us) deplorable situations may not feel exploited because there's no high standards set for safety in that country. But to us, it certainly feels like the company is exploiting the fact that they live in a country with less protections.
The free trade questions is biased towards those who support unions and American jobs, because as with the "standard of living" question, most people are thinking about American jobs, not jobs worldwide. So while free trade doesn't lead to unemployment in total, free trade in America has led to loss of those jobs, which people see as unemployment.
I really have no clue how they didn't see those questions were biased.