Ever since I found out burger king just adds the "char" flavour and paints on the grill lines, it's taken away from the flavour a little bit. It was what, the past 10 years or so they stopped actually flame-grilling their stuff? It's hard to deal with the change from legit to microwaved. They also don't cook their nuggets for long enough to make them crispy (when I request to cook them longer, and they are feeling kind enough to do it, they taste far better). Their chicken sandwiches aren't very good anymore either. Fries are great though.
Mcdonalds...well. I have one near me which is the worst food I've ever eaten. it's just...terribly run with terrible equipment and management. Plus they always get my order wrong, poorly cooked/not cooked long enough/gross tasting, and take forever. A few minutes away is one of the best run ones I've seen. Their food is always brilliant. Nuggets are cheap and tasty. Super fatty though so I can't do it often, but it's a nice treat. So ya know, it varies wildly in quality.
Oh, ask for a mcdouble, onion and cheese only, add mac sauce. Cheap bigmac. Also ask for no salt on the fries. Usually they'll just shake off what they've got, but sometimes they'll just give you fresh ones.
Personally I prefer 5guys, taco bell, or Popeyes. That chicken sandwich is legit.
Man, I the regional stuff is usually the best. McDonald's poutine fries are pretty good, if a bit runny. I would adore the have curry here in the States.