Most fast food is terrible, not just in terms of taste preference, but in the quality of meat and other food staples involved in making the meals.
It has been a while since I looked it up, but at last check McDonald's came in dead last in terms of the quality of beef and other meats they order and the freshness of their vegetables. Highest on the list are restaurants like Wendy's and BK. (Those two constantly trade places in the top spot.) While the top chains serve food that is considered quite edible by most nutritonalists standards, chains towards the bottom are barely fit for human consumption.
So next time your kid wants to go to McD's tell them. "Not a chance because I love you and don't want to slowly kill you. Ronald McDonald IS Hitler."