Aurora

Kim Stanley Robinson's latest book is a long story of a generation star ship's voyage.  I found a bunch of the crew reactions to be completely at odds with human nature and I intensely dislike the odd, unmotivated behaviors.  Worst for me was their reaction to the pathogens.  The pedantic evolution of the ship's AI, as well as the depressing view of the future round out my major problems with the book.  Still it was fun to read as the story unfolded through interesting plot twists.  2/5 star -- there are better space opera books out there.