Adam Roberts at Punkadiddle puts it succintly: "The single best SFF novel of the year, I'd say." (Roberts' short item.) At Strange Horizons Roberts wrote a full-length review: " ... there is a pervasively numinous quality to LeGuin's imagined world; finely rendered and completely believable, it makes for a brilliantly compelling textual universe." Yes, and yes again.
Roberts also participated in a discussion that spread across several blogs:
Introduction -- Torque Control
Lyric and Narrative -- Punkaddidle.
Fantasy -- Asking the Wrong Questions
History -- Eve's Alexandria
Laura Miller at Salon.com wrote:
Lavinia is an old writer's book -- Le Guin is 79 -- in the best sense of the word; it is ripe with that half-remembered virtue, wisdom. This, Le Guin seems to be saying, is what it feels like to be the personification of your land and your people, to speak the words and perform the rites of "the old, local, earth-deep religion," to be the sacred guardian of harmony and plenty for a handful of rustic villages and farms, and to carry their past and future in your body.I could go on quoting other reviews, but I think the point has been made. This is a book worth your time.