If it does not exist yet, we could introduce a concept of "depth" for any field of skill. Like creating art in a certain medium. To explain by analogy, sculpting marble or carving wood vs painting on canvas vs story writing.
Let us assume that each field has the same possible depth. Or maybe level of artisanship that can be achieved.
The point I am getting at is now this: how easy or hard is it for a non expert to judge and appreciate at which level any given piece of art is.
Are there maybe art styles where it is harder to evaluate the skill involved, beyond the mere impression of: I like what I see. For that matter, even with skill, it could still be ugly, yet you might appreciate the skill.
The "problem" with 3d is, that we live in a 3d world. We are used to seeing that stuff irl. So for 3d a assume it is harder to get good results. For pixel art it is so much removed from reality, that it is easier to get to a level where people say, oh, look, it's pixel art. Where they would say, oh, look, it is cheap looking 3d textures. Even though both artists might have the same level on that depth scale of artisanship in their respective field.
Of course it might just as well be, that different fields have different depths of achieveable skill - till a virtuoso comes along and demonstrates that there is yet another level.