I don't believe that, and I've heard all the urban legends. (when I was a kid, I heard varying accounts that said that everything from dogs to ground up human corpses from cemetaries could be found in mcdonalds meat. all bulls***, of course, but kids will believe anything)
the reason why the mcdonalds meat tastes strange is b/c they half-a** the process by cooking both sides simultaneously to save time. I know this b/c I have acquired the
mcdonald's recipes. THe original recipes, the way they were years ago when the food was actually good.
the chicken mcnuggets are nasty, though. They are little more than chickens that have been crushed into paste, deep fried, and molded into the familiar shape.