Lots of really inventive ideas in this book. I especially enjoyed the hard science of it. I would like to give it a higher rating, but it had two drawbacks that dissuade me from doing so. 
 1. There is an abruptness to the writing style that makes it feel matter-of-fact to the point of taking away from what should be incredible sights or from what should have been strongly emotional scenes. That made it harder for me to really get into it, like I might with other novels. Part of this is the hard science approach, and part of it is a somewhat flawed (in my opinion) writing style. 
 2. A certain level of misogyny. Hating women is, as a rule, unjustifiable. On the other hand, since the book was written over forty years ago, it is also unjust to judge it my modern standards. I try to take the book at face value as much as possible. However, inasmuch as I am but a man, I admit my bias toward feminist ideals makes this difficult to do generally and impossible to do absolutely.