Is there an objective way to view an art work? Can an art work be objectively better than another art work? For example...

How is it not beautiful?

im sorry, were you saying pop music is modern art?

What is it then? Alien time travel shit?

Nuance. Harry Potter is pretty direct in what it wants one to imagine/feel and if you are to ruminate deeper, that's fine. Deeper works provide arguments, insights, etc. that allow the mind to be provoked. I think it was Kant who called it the "quickening," which allows one's mind to actually play with complex ideas. Read his work on Aesthetics but it's more related to music and paintings than lit.

The swordsman that defeats his opponent, is he not objectively better at swordsmanship?

Depends on what the art is for. You don't judge all sports equally do you? You have to judge them individually within their purpose. Harry Potter and Hamlet are not the same sport. You can compare Twilight with Harry Potter, but not Hamlet.