Many viewers complain about the back half of Battlestar Galactica. After two seasons of space battles and political intrigue, season three began with the Cylon occupation of a demoralized insurgency. Though the last two seasons of Battlestar operated at a different pace, they were true to the promise of the show's earlier episodes. The keeping of that promise began with the occupation of New Caprica. Ron Moore's goal from the beginning of BSG was to create something that was more than cowboys and Indians in space. He aimed to explore lives of the last members of the human race with all the desperation, fear, and pain that would come with it.
Through the first two seasons, we want to believe that if the crew of the Galactica could just find a new planet, the crew and the civilians they protect could start a new life. In the back of our minds, however, we know that could never be. From the moment they landed on New Caprica, we know that any peace will be temporary and end poorly. It's easy to get upset by the aimless and hopeless elements of the later episodes of Battlestar. It's hard to watch some characters cling to spirituality or love or anger while others get lost in despair. But, in the later seasons of the show, Moore delivers the message of the series: fighting for survival is easy until you survive long enough to ask yourself if it's worth it.