I suspect there's a fairly high variance within the US, too. I've never had a crappy McDonald's food, but I'm usually in an upper middle class suburb or downtown Seattle when I go.
I'm from BC and have had mcdonalds from downtown/suburb seattle* and it is pretty different, definitely not as high quality imho and a different taste too.
Strangely having mcdonalds in eastern europe was more like canada then the US.
Strangely having mcdonalds in eastern europe was more like canada then the US.
*last time was a few years ago