Isn't that the case with each and every ranking? If the ranking is in someones favour it is amazing and proof of the hard work, if the same company or organization does poorly, the ranking is trash, does not use the right metrics etc. etc.

As for AC indeed I do not need a ranking to know that the on-time performance is bad, the service has gone downhill, the food and drink selection is nothing to write home about and and and. Personally, I still fly AC on a regular basis but that is certainly not a result of their amazing service and product.