Aren't we pushing a bit too far now?

If quality is describable only with terms as good and bad, then quality is equal to preferences and in that case quality would vary from person to person.

There are quality standards such as ISO 9001 (which of course can't be used on music!) but even those can't put aside people’s preferences, since quality is something that we as individuals “feel” about a product or something similar. Overall one could state that we as consumers do agree about quality, but when it comes to something so closely linked to pure feelings such as music, quality can differ widely from person to person.