this!: "Feedback is not only love, but often as important as the subject of the fanwork itself." I say this, or something akin to it, at least once a week. It is my first rule of fangirl-ing.
in otherwords: I review fics a lot. I know how reviews can help an author know who they did and what can be improved on. And how nice it is to get positive feedback on a story. Because of this, I have developed a nurotic need to review most of what I read. In fact, the only times I don't comment on a fic is if it's so terrible I can't finish it or it's so blah that there is nothing to say, positive or negative.