You make some good points that I haven't thought about, and they're really concrete things. I don't think any of them are things I usually consider much, though (well, apart from the basic spelling and grammar thing, but then I probably won't even like the fic if it lacks those qualities).
For me the big one is something I can't even put my finger on, and which I often can't predict before I try reading a fic. It has to do with character voices combined with the author's style. I know that there are some characters I have a hard time with. For example, I find Geoffrey Tennant in Slings and Arrows hard to read, despite really liking him as a character. OTOH, I can easily read Billy Tallent in Hard Core Logo, even though I don't identify with him as a character at all--he's just very different from me.
Then there's the author's style. I sometimes really like an author's style, but I can still have a hard time reading it. And different styles and character voices can feel very different for me to read--some make me want to speed up, some make me want to slow down, some make me want to articulate clearly and some make me want to do the opposite.
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For me the big one is something I can't even put my finger on, and which I often can't predict before I try reading a fic. It has to do with character voices combined with the author's style. I know that there are some characters I have a hard time with. For example, I find Geoffrey Tennant in Slings and Arrows hard to read, despite really liking him as a character. OTOH, I can easily read Billy Tallent in Hard Core Logo, even though I don't identify with him as a character at all--he's just very different from me.
Then there's the author's style. I sometimes really like an author's style, but I can still have a hard time reading it. And different styles and character voices can feel very different for me to read--some make me want to speed up, some make me want to slow down, some make me want to articulate clearly and some make me want to do the opposite.