The atmosphere at McDonald's is obnoxious, plastic, inhuman, cold, and impersonal. It has no soul, just as the food lacks, well, everything. One doesn't go to McDonald's to enjoy a meal: one goes to get eating over with so one may do something more important--- like picking lint out of one's belly button. One hurries in and out, rushing to stuff one's gut with crap that is quick and easy--- one does not savor, enjoy, and linger over McDonald's food. McDonald's is no fun. It is not spicy; it is not tasty; it is not to be enjoyed. It's as bland, blank, and as tasteless as sand.
On the Shy David scale of from one star to six, I think McDonald's earns one star (if the scale went to zero, they'd get a zero).