When travelling overseas McDs is a godsend as you know it is something you can trust. After two weeks in India I was more excited about coming across McDs and having a Chicken Maharaja burger than I was about seeing the Taj Mahal. In London I only have McDs when travelling or when drunk as there are better options.Plenty of exceptions to the rule but you're not going to find lots of well heeled, educated people eating at Mc Donald's.
And on a work trip to Russia all my educated workmates and I happily had McDs for dinner.