I'm jumping in very late!
Over the past 3 years or so I have been watching Battlestar Galactica on DVD and Blu Ray as my only means to see it. (deliberately) I got into S1 and S2 and was hooked. It was an engaging reimaging. I saw Galactica TOS in 1978 and a few times in repeats, but never got it on DVD.
So last year, I finally got back into Season 3 after stopping midway in S3. And I finally saw the conclusion of S4 last night. I've avoided reading all the Galactica threads. So it will be interesting to see your comments here. What a season full of shocks and surprises! As for the end, I liked it. I did see some comments earlier here today. I never thought Kara was a Cylon. I never thought for sure Roslin was one either. I did accidentally hear a spoiler 2 years ago that Tyrol was a Cylon and that was a disappointment to see. But it played out well and It wasn't such devastating news as I thought as he turned out to be one of the good guys.
Baltar could have been one, but it was interesting to see his thread revealed.
As for supernatural or fantasy verse sci-fi regarding how it ended, well, I thought it was very sci-fi. The overlords or whatever beings the creatures that appears as Baltar and Six to me were like the Organians in Star Trek, or the aliens in 2001. Very powerful, very old and act as guides for other beings in their development. It was interesting to see their final comments of whether the cycle of violence and destruction was broken.
I was really trying to figure out what Kara was after she returned. Was she a clone, or something else. I really like how they threaded the notes of the song as the FTL coordinates and how she figured it out. She did fulfill her role. She was like a Guardian Angel who was sent back to help guide them to the Earth, our Earth. Though I had hoped she and Lee would get together and make babies.
Also I was thinking, it's been a log time since I've seen TOS Galactica, but I remember an episode of very powerful beings in a white crystalline ship. They had Starbuck and Sheeba and Apollo. Apollo died and they brought him back. Felt like Moore was riffing on some of that and also building on the mythology from the original series. Only they didn't have Patrick Mcnee here as Count Iblis. Or perhaps that role was given to Leobin.
And it wasn't clear to me fully the mythos, The Lords of Kobol and so on.
I'm still digesting it. I was not disappointed. And I'll have to find time to watch the extended cut of the final episodes.