The thing about science fiction is, its really easy to do bad science fiction. But when its good its better then anything else. (O.K fantasy works the same way).
BSG(!) and Firefly I loved, and I have very fond memories of TNG and DS9 from when I was a kid.
Ones no one mentioned yet, maybe they arent all in space with shooty laser ships but I still consider them Scifi...
Black Mirror. There's been episodes that have been incredible, among the best I've seen like San Junipero and even if some are very hard to watch not a one that's not interesting.
Sense 8 by the Wachowski sisters of Matrix fame and co created /written by J Michael Straczynski. Its a weird one about a telepathic/empathic link between 8 different characters from all over the world. Cancelled unfortunately
The OA, that show got me by the feels. Dimensional travel, psychic power and near death experiences. Got cancelled as well though.
(Its cold outside, there's no kind of atmosphere, I'm alone alone, more or less...)