I'd have to agree, although critical consensus can be reached as to what the standards something must surpass to be considered art, it will never be objectively correct.
I disagree on the consencus part there.
If there are to be some standards for what is art, what's something that fulfills some of them, but not all? Is it pseudo-art? Mimicry? It just becomes pointless. It would be absurd to try and define the standards. Like with games and books.
Two completely different things, should they be held by the same standards? And if not, is it because they are different, or because one is more respected than the other? And if they are held by the same definitions, it all boils down to aesthetics, ignoring large portions of at least what a game is.