Don't some of the top hospitals pay/donate/give money to the data gathering companies that US News uses to compile it's ranking?
As a patient to know the best hospital I would want to see data on; outcomes, adverse events (mortality), rate of medical mistakes, average length of stay, complexity of medical procedures/diseases, rate of unexpected mortality, rate of physician/nurse's washing hands upon entering and leaving pt rooms, comparison between one hospital and the others in the same town/city, average cost of hospital stay compared to other hospitals...etc.
As a resident wanting to know the best training program I would want to know how many faculty there are, how many actually teach and are involved in clinical duties vs. just working in their lab, placement of previous residents into PP vs. academics, fellowship placement, % receiving early career awards out of those who attempt to receive one, happiness of residents, happiness of recent grads and whether they would recommend training to others...etc. Just a few thoughts that I had.