Too often books are forced to work doubly hard to tell a story and present a message because there is a lack in the publishing world they need to fill. "Black Sun" did not bother too hard with the message. Meaning, the author wrote characters who were, for instance, of a third gender without spending precious time explaining that. It was completely normal to the characters enough so that it did not warrant explaining.
I did not like the different perspectives evenly, however, and I think there were a few characters whose perspectives weren't as necessary as others. I wanted more of certain characters and less of others, basically. Overall, worth a read.