This is just kinda stating the obvious, isn't it?
Like, fundamentally I don't even understand the appeal. If porn or hentai were just nudity and sex, I would get it. But they always have to go into unnecessarily gross detail or show things nobody wants to see, or draw the women with stupid proportions that almost seem like a parody.
"Here's insert-anime-girl naked!" the picture promises.
Inevitably it has at least one of the following problems (more often a combination):
-Not really naked, she's still wearing a shirt or otherwise mostly covered, just you can see her butt or something. Sometimes these images will just be underwear shots, which who fucking cares?
-The proportions are all wrong, like one feature is exaggerated more than in the source material or the art is so different it doesn't even look like the same character.
-There's strange fluids all over her.
-You can see men with their dongs out in the picture. Because that's exactly what I want to see if I'm looking up naked women--Penis!
-The position is one nobody would ever actually make and the girl is making a stupid face--usually either faked-shock or some lame attempt at a "sultry" look.
-If its a bondage picture, the girl will be tied up in a way that would actually be excrutiatingly painful or uncomfortable, and in any case isn't alluring at all.
-In the case of movies, they have the problem of having to fit in a million different fetishes so what'll happen is in 20 minutes, there might be one part that would theoretically work, but the rest of the movie is just gonna make you run for the brain bleach. This is before getting into all the other well-known problems with porn like the ridiculous characters and premises that are all-too-aware they exist just to serve a purpose and thus the movie feels like I'm watching a bunch of robots more than people.
(That last one is one of the few cases where I can understand animated porn more than live stuff, though.... animated characters tend to at least be kinda good looking. Every porn actress I've ever seen looks like she could be someone my mom knew in high school).
Just dear lord. Movies and shows that aren't even trying to be porn but just happen to have nudity are more "fit for purpose" than actual porn.