I disagree. McDonalds in the US is gross. I've had McDonalds in Europe 4-5 times and each of those were pretty OK.
(Why am I eating McDonalds in Europe? Sometimes when you get off a train and don't have your bearings yet in a place, something fast that's a known quantity is the way to go even if it pales to other options you'll find soon).
The "Here" app loaded with a country has all the McDonalds, which are guaranteed (almost always) to have a restroom and wifi. Can be worth it's weight in gold.
(I don't notice a ton of difference between USA McDonald's and other ones, though the taste can be slightly different, and I don't usually frequent McDonalds in dense urban areas in the USA.)
(Why am I eating McDonalds in Europe? Sometimes when you get off a train and don't have your bearings yet in a place, something fast that's a known quantity is the way to go even if it pales to other options you'll find soon).