Fade: I'm not saying you can't both enjoy Twilight and have naked butt sex; it's a matter of "there's something better two blocks down."
As for fries, come to western NY. The McDonald's fries there are watery garbage sprayed with salt and if you enjoy that, I can point you to a cow pasture. I've not tried McDonald's fries since moving from there, as I have no reason to, but it was more than one McDonald's restaurant. And I love steak fries. If McDonald's served steak fries, I'd be all over that. But they sell this potato rejection hash.
I will say they're not as bad as Wendy's fries, but that's not saying much.
I think your roommate is wrong. Yeah, a lot of science has gone into promoting and to engineering this stuff for mass consumption, but that's not an exact science on a world of billions of people, or when poor decisions are made. Their cheese is garbage. They put too much gunk on a burger to the point that it's almost worth getting a spoon. Fries, see above. Nuggets--where's the chicken? I don't mean they don't use chickens; I just think you get more fried bread bits than meat in your average nugget.
Wendy's does better with how their food is actually assembled, though it tastes like styrofoam.
Burger King burgers are a shadow of real burgers--they only make me hungry for the real thing. Knowing I can have something more substantial and better-tasting if I just put in the effort to go get it doesn't make me want to spend my money. I will admit that I like BK fries though. I don't eat them, and they're still shit for you, but they're firm and flavorful, like from flavor country.