Ursula le Guin writes like a paradox. Her words are so simple, so calm, so obvious, and yet what she says is complicated and often ambiguous. The more she hones her writing down the stronger it bites on all the deep levels. Reading her is like having a glass of cool water from some immensely deep spring.
I am not sure why her EarthSea series isn't more famous. She presents an alternative to the stark good-and-evil ethical structure of most of fantasy, and she does it very well.