Is it worth sticking with it to the end? I loved the first couple of series, enjoyed the third, but struggling to be fussed about the fourth series. They're racking up on the sky box and we never quite feel like watching it. I'm at the point where I only really want to know what happens at the end, and will be annoyed if it ends craply.
As a side question, am I supposed to understand why Earth is the 13th colony? We missed the first couple of episodes and I've always wondered what the chronology of it all is, why they all worship ancient Greek gods and have planets named after the zodiac but are all futuristic with their technology.