I found this book fascinating how the cultural revolution was weaved in to the story. It really highlighted my ignorance of recent Chinese history, and many times found myself turning to Wikipedia to learn more of the specific events mentioned. The English translation also includes several lengthy footnotes and see-also's when historical characters or events are mentioned, as I'm sure many western readers are less familiar with the details of the events and historical characters.
Without giving away anything, I also found the Egyptian scene truly awesome.
I’ve read the first book, I really enjoyed it.
Also read it recently and was disappointed. It's written in a style that I associate with continental philosophy. Obtuse language that can be difficult to follow.
That wouldn't be the end of the world if the underlying ideas were really brilliant, but I wasn't convinced.
But question - when you say cultural importance, do you mean in terms of what it talks about? Or was the book itself important culturally? (I'm not sure how well-known the book itself was, I've always gotten the impression that Octavia Butler is a less-known SF author).
The Three Body problem. The Lathe of Heaven.
And while I haven't read Parable of the Sower yet, everything I've read of Octavia Butler has ranged from really good to some of my favorite books ever, so I'm sure it's a good one.
One anti-recommendation (kind of): I recently read Finite and Infinite Games, after many (many) recommendations for it, and didn't particularly like it. Obviously I'm in the minority on this, but I really wonder what other people saw in it.