I read left hand of darkness and loved it. It was my first Le Guin. I had heard a lot about the gender themes, and was surprised to find how it does not it you over the head at all. It was a great adventure and just really stuck on your head thinking. The dispossessed was another one like that. Its message is a little bit more obvious, but is an incredibly well built world that really is anarchist. All of her works I’ve read so far are great to read. There are extremely strong themes, but she seems to present it a bit more as a take it or leave it approach than a lot of the other (cough, Heinlein) I grew up reading.