Good writing? You're kidding. At best, it's fanfic level, not literature. But after all, we've all been exposed to cheap, third-rate literature at various times. For example, most science fiction writers of the “golden age” did not rise above the standard for those times level of tabloid reading. Nevertheless, Asimov, Heinlein, Sprague de Camp, etc. are still published today.
I have invented a term for good (on a general level) AVNs - “sensual urban fantasy”.
And imagine, I read books, and I spend more time with them than with AVN (about 90% vs. 10% ratio). Also, I'm not really a fan of KN/VN. I prefer games, and there's very little game component in VN.