I definitely agree that there is no absolute way to rank them "objectively" - meaning between people.
But each individual can and does rank them moment by moment, and the particular experiences involved are readily evaluatable in terms of greater or lesser pleasure -- at least that is how I see it.
We agree there is no "absolute ranking" but we are apparently disagreeing on whether it is possible for any individual or group of individuals to perceive the experience of pleasure as greater or lesser, and to that I would say "surely so."