Originally Posted by Canis
No, none of those are objective at all. I've studied linguistics. Even "what is grammatical?" is derived by polling the populace. Seriously. Grammaticality, despite my 7 years of grammar classes in school that tried desperately to instill a standard, is in actual fact derived from common usage.
I would point out that this is a particularly English thing. Other languages, such as Korean or Japanese, do have a "standard language" that is followed.
However, even though languages do certainly change over time, and those changes are based on common usage, how is that subjective? As a word is adopted into the language, THAT becomes the new standard. Just because a standard changes doesn't make it subjective. Objective doesn't mean that it can NEVER change. If it did, then there is no objective standard ever. Even science has changed numerous times over the years. That doesn't make the sciences subjective, it just changes the standard.
Now, it's true that usually a group of criteria will be chosen based on whatever point the critic is trying to make. Someone saying that X is bad will choose criteria in which it fails to acheive a standard. Someone who wants to say that X is good will choose different criteria.
For example, detractors of anime generally point to the face faults of the art style (not that this is universal, but, it is a general trend). And, they have a point. The facial stylings of many anime are very simplistic. Whether that's a good thing or bad depends on who you ask, but, there is no getting around that Sailor Moon's face doesn't look realistic at all.
It's like studying history. It's 100% true that you can never be entirely objective. But, that's the goal that all historians strive for.