Why? Two words: magic and place.
Magic: the way he makes it absolutely real, but utterly mysterious. We don’t know how it works. We don’t really even know what it is; it’s some kind of force, but it’s capricious, not subject to control. And the explanations we get about it from his characters are ambiguous and vague, but somehow nonetheless ring true.
Place: his sense of place is so strong. It makes me jealous. I want to figure out how he does it.