IME one of my all-time favorite shows. While, yeah, there were some questionable artistic choices sometimes (let's face it...every show has 'em) all around the show creators seemed to know their audience was intelligent and could handle a complex political drama. I never felt like the plot was spoon-fed to me. All the characters had depth, which allowed for rich interpersonal conflicts to drive the plot.
I also like how they weren't afraid to go dark, to add twists that were so gut-wretchingly tragic you didn't know how they'd go on.
But, of course, I also loved how BSG was mainly a mirror about us...from the birds-eye view, the Cylons were a lot more ethical and moral than humans.
A show way ahead of its time. TBF I think it would be way ahead of its time if it was released today, too. Haha.