@hue-man,
Objectivity is not the sole measure of truth, and there is no such thing as complete objectivity, or an absolute object.
In the case of artworks, one thing that might be worth considering is the idea of 'classical beauty'. This is associated with various cultural traditions, with, I suppose, European high culture being a particular high point. When you consider the universal appeal and longevity of the works of art of the great European masters, the Mozarts and Handels and Bachs, or the Da Vincis or Raphaels, and also the great works of literature, I think you can see in many of these works some similar qualities. Firstly they are works of genius. Second, they often embody themes, ideas, or perhaps archetypes, which have spanned generations. So there is a reason why classics are classics.
Maybe those days are gone now. Certainly looking at modern art, music and literature, one might think so, although there are probably classics being made now which won't be fully appreciated for some time.
Anyway, I like Steely Dan. Nothing objective about it, they are just the best band ever.