A service can only be considered as “good” if I can get it. I would never give a restaurant 5-stars if I could never get a reservation.
You demolish your own argument. A restaurant can perfectly well be 5 stars without you having access to it. In fact, high quality restaurants are often hard to get into, whereas McDonald’s (and Cuban health care) are topnotch for access. If you starve on the sidewalk outside a great restaurant, the problem is not with the quality of the food.