I think in general it is healthy to not only focus on calories. I understand this is about McDonalds and people understand it isn't the healthiest food.
But to me I focus on carbs and avoiding processed foods and all those chemicals. I haven't counted calories once this past year.
I think this is an excellent discussion. But for me making a choice it is about carbs and as whole foods as possible. So if I eat there I suppose a salad would be best and then the least processed dressing possible.
The burgers when I eat there were HIGHLY addictive. I think they have food engineers doing who knows what to enhance that.