Who knows? The rater in question may enjoy giving negative reviews of fantasy books that she secretly enjoys because she knows it'll get a rise out of others. In other words, she could be a troll. Or maybe she writes in the genre and wants to pooh-pooh writers she sees as competitors. Could be all sorts of motivations behind the low ratings.
I think Goodread ratings are kind of silly anyway. In essence you're summarising a book with a numerical rating.
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