Big macs suck. The meat McDonald's uses for their burgers tastes like wads of paper. And the buns are crap. The importance of the bun is so underestimated, that's the big downside to most burger chains. That and the quality of the meat. A good burger is hard to find.
how about not going to a burger chain?
i like this small place called Burgermeester that do a couple nice burgers. Blonde d'Aquitaine beef with pancetta and real cheddar, or Texels lamb with chorizo and jalapenos, or, or... they use (pretty soft) kaiserbrod style buns.. and they do cute mini-versions as well, for half-price:
That looks and sounds awesome