First you are using a double negative.
So are you asking if it is good or are you asking if it is not good?
It depends on your definition of "fast food"
It depends on what you order.
I just had what I would call "fast food" I had a spinach salad with raspberries, blackberries, blue cheese. NO dressing, no croutons, no bread. I am also having a bit of what the store calls "krab" salad, made with fish that is supposed to taste like crab. In any case I think this is a pretty healthy dinner.
So YES "fast food" can be a healthy meal.
I bet my dinner was a lot better nutritionally than someone that had a home cooked meal of fried chicken, mashed potatoes, biscuits, butter or gravy on the biscuits.