Sure, there's some subjectivity here, but there are also matters of taste upon which most of us will agree. Triple the salt on that steak, for example, and we will find consensus on its being too salty, at least in every culture whose food I've eaten.
So let's ask: Will we find consensus, here and now, on grape juice having too strong a flavor?
If not, a mostly-earnest followup question: Given its popularity among children, does Big Fruit Juice have a responsibility to dilute it to some minimal extent, the way Pepsi developed a different shape for salt in order to reduce the sodium content of Lay's?