Most of it is shit, but I think your reasoning is backwards. I don’t think people (At least Americans/Westerners) like anime because it’s Japanese, they like Japanese stuff through exposure to it in anime.

When we were kids and watching stuff like Pokemon and Yugioh, none of us knew wtf anime was or where it came from. They were just some more cartoons. In fact the localizers like 4Kids actively tried to scrub “foreignness” from the shows because they thought it would ick American audiences.

And this pop cultural dominance has been very successful at rehabilitating Japan’s image, both erasing the past and glazing over some of the uncomfortable parts of the present.

As for actual show quality, I’d say all mediums have mostly bad art with a few gems, but I do think anime is exceptional in two ways: First, it seems like the barrier to turning some random author’s bad ideas into a commercial product are much lower, I’m not really sure what the exact economic or cultural reasons are for that though. Second, most anime ends up being kind of bad in the same way. It’s a medium that’s practically defined by it’s tropes and they are shared amongst the good and bad shows alike. The difference is usually that the good ones have something else worthwhile going on and the bad ones are almost nothing but a reheated remix of these tropes.