My mental image of writing quality is somewhat like a many-dimensional moss ball branching out from a central point.

In the centre there is unequivocally bad writing, mostly written by writers with no experience writing. As you follow the moss outwards the writers get better, but they get better in different ways, and different readers have different requirements.

It seems to match reality, at least somewhat. There are a lot more ways to be good at writing than there are to be bad at writing. Unfortunately, while this means it's possible to warn people away from bad books, it makes it hard to recommend good ones.