Oh, go away with this quality is subjective drivel,
Art, as a means of communication of ideas, is inherently subjective. The import one may get from a work isn't guaranteed to be the same from person to person, and may still differ from the intentions of its creator. How reasonable such variation (and discrepancy) is, depends on the work and the people observing it. You can't get past this reality.
People that harp on "objectivity" when describing their thoughts on comics have no security in their own opinions, so they latch them on to the concept of "objectivity" so they can believe that they're unassailable. Such people don't even understand art in general, which is why they
talk like there's some formula to making a good work that some people somehow deliberately don't take-- even as they don't consciously
think like that.
That doesn't mean that some opinions about a work can't be better argued than other opinions, and therefore be taken more seriously on account of having more substance. But if you don't recognize that any praise or criticism of a work is
invariably you explaining the thesis "I do (not) like this and I think you should agree with me", you actively risk talking in ways that make no sense to the people around you.
"Subjectivity" does not mean that every opinion is equally rational.
At any rate, my larger problem with your comment is its out-of-place pretentiousness-- you're talking about "literature" when we're reading
comics. There's in fact such a thing as a comic with substance, but be honest enough to recognize the aisle you're in.