I am not generally one to be dogmatic about food and diet. In fact, it annoys the piss out of me that a lot of people are so absolutely sure that they have all of the answers, and that they apply to everyone. The people who are all "I eat like a caveman" whilst sucking down protein shakes and energy drinks (which are so obviously prehistoric) need to be punched in the balls. My dietitian first wife apparently encounters these people daily, and they insist that they know better than she does.
That said, I think there's a logical and natural desire for people who think about what they put into their bodies to stick to things that are actually real food. They may not be completely religious about it, but they understand that organic foods aren't exposed to hormones and pesticides, that you should generally eat more green stuff, and packaged foods are often asking for death by sodium. Some people go to extremes, but I think being mildly self-aware that a package of ramen noodles is not good for you is good.
Given just a shred of this awareness, I find it insane that anyone is OK putting McDonald's food into their bodies. It's barely passable as food. If Morgan Spurlock and Jamie Oliver haven't scared you shitless into understanding what that crap will do to you, I don't know what will. How can you be OK with having dimethylpolysiloxane added to food to act as an "anti-foaming agent?" Why would your food foam?
I stopped eating fast food about seven years ago, for the most part. I've been known to stop at a Wendy's in a pinch, but even then, my last stop was over a year ago while driving across the country (choices are slim in Nowhere, South Dakota). I've done my share of "fast casual," but Chipotle uses real food, even if some of it is high in fat or sodium. I had an Egg McSomething last summer and my stomach instantly turned on me. That shit is nasty. And don't even get me started about how the french fries never decompose.
I find it unfortunate that McDonald's can exist as a business, because consumers are willing to consume it.