The book is not very typical of sci-fi works out there. Its main purpose is to draw a comparison between a Utopian anarchist society and a capitalist society. It does so by picking up a character to follow (a physicist named Shevek), and placing the him into both societies, observing both the reactions of the character to the society and of the society to the character. In doing so, the book makes some interesting points and observations, which make the book worth reading. I can not say I agree with all the points expressed in the book, but they are all expressed well enough to understand the messages the book tries to convey.
Only four stars because she could have developed the storyline a bit more.