Fast food is so gross! I was raised on it and am extremely familiar because my mother is a loser at all things domestic. And Memphis is replete with all manner of fast food everywhere, even in neighborhoods that apparantly cannot support a supermarket. It's slime that's not fit for animal feed. And my brother is raising his kids on it, which makes me want to cry.
Back Yard Burgers is a local chain that is somewhat better. A little more expensive, and higher quality. I eat there a few times a year. Kind of a guilty pleasure. Probably comparable to the In N Out people are always talking about, but I don't really know because we don't have them here.
EDIT: Checked out the In N Out on wikipedia. WTF? http://en.wikipedia.org/wiki/In-N-Out_Burger#Bible_references