They're aiming for different things. Fine dining is intended to be an experience, while fast-food is an anti-experience where the point is to get fed as quickly and easily as possible.

Still, I have to say that I have eaten in restaurants where after I had to conclude: I had better gone to McDonalds :p

I'm not sure I agree with this as the customer. Sure, the fast food businesses just want to get as many people in as possible. But, as a customer of McDonalds[0], there is a time and a place where it's a treat and I enjoy the experience!

[0] in the old days when I consumed meat