A little detail to your extra detail :-) I agree that there's a general "it'll do", motivated by just pushing something, anything, out there. But I think that's party because they don't know better. The people who generate the articles that reach the HN front page surely interact a lot with their agents. Their agents will certainly talk to them in "AI-shaped", "LLM-marker-bearing" bot-speak, but they apparently don't mind, because they can't tell that this is bad writing. If they did, if this annoyed them as much as it annoys many of us, they would surely adopt some style guidelines for their agents. And those should apply to their blog posts too.

As for the rating system, we already have many people who first check the comments for things like "AI, don't bother". I think that's OK; it could be better by quoting two or three sample sentences so that others could quickly judge how bad it is. I don't think it needs to be more formal than this.