What makes a good story? A good story = big questions + even bigger (or surprising) answers. If the questions are not big we lose interest along the way. If the answers to those questions do not defy our expectations or surprise us in some way we will be dissatisfied in the end. Even worse, if the questions remain unanswered, we may feel ripped off.
What big questions does the novel Temeraire ask so far? What do you think the answers will be?