In different areas of the country the quality will vary.
So true.
In Michigan, Dairy Queens were (when I lived there) scary places to eat. You could get a chocolate-dipped soft-serve cone, but I'd be afraid of cockroaches or rampaging armies of microorganisms in anything else. When I moved to Washington State, I noticed that Diary Queens looked *clean* and was startled. I had to try one, and they were pretty good.
The best food poisoning story I know, by the way, comes from my very own company. One of our guys went out for a machine installation in China, came back to the US, and immediately manifested bad food poising that required medication to eradicate. I asked him what he thought it was from. It turns out that, shortly before getting on his flight home, he went to a 7-11 in China and ate a dinner of meatballs there. "Ye gods," I said. "Meatballs from 7-11 in the US would probably nearly kill you. What the heck were you thinking? Are you suicidal?" I could just imagine those meatballs, floating in yellowish fluid at the checkout counter, customers and counter workers coughing and sneezing over them for weeks, warm to the touch, but only because of internal bacterial metabolism, not because of a heated tray.
There is a lesson here. It is a lesson like: "Don't take a running chainsaw and use it to saw through your own guts. That is a bad thing to do."
You know, I just realized that one of those meatballs might have evolved a civilization, like in Horton Hears a Who. I shall now refer to my coworker as Destroyer of Worlds.