I watched anime in the 90's and in the early 2000s when it blew up. There was plenty of adolescent trash released back then, but we tended to get only the better productions and the ones that appealed to adult sensibilities, for better or worse. I think as anime got bigger and the floodgates got opened, we got more of the everyday shlock that is mass produced for Japanese otaku, just piles and piles of garbage harem and moe shows, and we got fans who were more in tune with Japanese culture (relatively speaking) who set out to like anything that was popular in Japan solely because it was popular in Japan. Those people cheered on all the garbage of the last 10-15 years and probably prevented the medium from breaking through when we had a critical mass of artistically respectable productions that were gaining mainstream awareness back then.
Like others, I lost interest in it because of the fetishization of little girls (even when it is not sexual, there is a fixation on them as central characters that seems problematic to me, psychologically, for an adult to be into so much), the tropey-ness of the medium that makes TV sitcoms look incredibly varied by comparison, and just the overall lack of agency and respect for women. And unlike most any other medium there is just no real reflection on actual human life and relationships.
A big problem with these discussions is that, IMO, anime fans can't typically give accurate advice to non-otaku. Numerous times on GAF Ive been directed to an example of a strong female role that is laughable in reality, full of upskirts and shit, but she is a "bad girl" and assertive (or ADORABLY CLUMSY) and by otaku standards that is feminist. Women are barely more than squeaking objects in most anime, even "mature" ones that engage in no overt sexualization. It's like they are pulled out of some Victorian era drama, holding a parasol and gasping as an overly earnest anime hero declares their love. Is this reflective of Japanese society? I don't know. I know that otaku in Japan are notorious for not interacting well with normies, so maybe I should assume the general culture reflected in anime is just fucking wrong and toxic. It just seems like a MRA had some influence in how female characters should act in almost every anime I've seen.
I've had too many anime fans tell me a shitty show is good, because they love anime so much that they couldn't see that it was just another serving of their favorite tropes with slightly different window dressing. This a problem with enthusiasts of anything, where they overblow small details and differences in their own mind when in reality it is all much more similar than they can see.
The humor is usually god awful. It's sort of like memes, fans are laughing because it is a running gag in the medium, but isn't really funny. Is my sense of humor just simply different, not better than, someone who finds it hilarious to bodily fall over or get a nosebleed when a girl says something unintentionally sexual? No, I think I just have a better sense of humor.
Now someone with a little girl avatar can go ahead and tell me I pulled all of this out of my ass, and demand a list of the last 10 anime I watched.