I think the chains have figured out the food equivalent of i18n and l10n.
For instance, the McAloo Tikki Burger in India, and the McSpicy Paneer I hear good things about. Perhaps I'll try them next time, though I tend to prefer real Indian food when I'm there.
I might test that one day too, however what I referred to in the previous comment is the exact opposite. The cheeseburger, french fries, McNuggets, barbecue sauce, etc. - the staples which are available approximately everywhere in the world, and taste more-less the same. It's a baseline of somewhat decent food I already know. A safe haven - especially when I'm stuck half-way across the globe, and somehow, out of every local place I could eat lunch in, McD and KFC are the two serving the least raw sugar in their meals.
For instance, the McAloo Tikki Burger in India, and the McSpicy Paneer I hear good things about. Perhaps I'll try them next time, though I tend to prefer real Indian food when I'm there.