I love Le Guin's writing but don't think this is up with her best. It's a very angry novella; raging against conolialism (obviously inspired by the Vietnam war). From the author's note at the beginning it sounds like it was written in a rush and that means the characters are one dimensional (especially the villain) and there isn't much structure to the story. The Athsean's dream culture is interesting though, and the final downbeat message is important.