Ugh, I completely agree with your three cardinal rules. I also find that I'm becoming pickier and pickier about what fanfiction I read - which is a shame because I'm not sure how to stop doing it, but it also means I'm reading a fraction of what I used to. I can't figure out if I'm just not in thee right fandoms or I'm getting too snobby, but bad dialogue, bad characterization and shoddy grammar have really been getting in my way lately.