I dunno. The thing about the Big Mac is the convenience. It doesn’t really compare to actual burgers, but it’s got a distinctive taste, a handy size and no waiting time. On the other side of the burger spectrum are the restaurant café burgers that are difficult to eat even with utensils and still taste like something you could do better yourself. The best burgers are from some shady unknown local grill, but those are hit or miss. Anyway my point is that the Bic Mac is a fair product, but it’s not really comparable to actual food. I’m not disappointed with it because I didn’t expect it to be different from whatever it is and sometimes that is good enough. Like, I wouldn’t want to eat a gourmet restaurant every day even if I could afford it and had the time to wait for the bill.
Tl;dr: fast food sucks because it’s not food, but fast food rules because it’s fast.