I agree with you on the ending of battlestar, but season 1 and season 2 to me are the best scifi ever put on the little or big screen. it had amazing set design and yet still felt grounded in reality as far as yes it is the future, but unlike star trek, we still have to have water, fuel, and other resources. some of my favorite episodes had nothing to do with the cyclons at all, like them still trying to have a government with only 50,000 people left. I love how very minor characters at the start of the show were fully fleshed out characters by the end. I could gush on and on about the show. season 1 and 2 to me are 10/10. season three did take a dip and had more filler episodes so like an 8/10, and season 4 was a 9/10. the ending does bring it down some but there are also great set pieces in 4 that really help it rise up.
I am excited to see where the expanse goes, its too slow in some spots, but it does have an interesting set up, and I love thomas jane. either way its nice to see syfy channel doing this instead of that schlock they been doing. another good show on the channel is dark matter, its not perfect at all, but enjoyable.