My most favorite SF series was Babylon 5...now that was the way to do SF.
I sort of liked Deep Space Nine, but somewhere in the next to last year the story arc got goofy...and I stopped watching it.
Bab5 was pretty alright, at first. The first captain or whatever had that distracting cast eye thing going on, which was one of the reasons I liked it. The cast was pretty alright, and the digital special effects were pretty swell, groundbreaking for TV. It got pretty bogged down, perhaps because of the anti-Second Amendment wank who was the alleged creative force behind the series.
DS9 was mostly awful, but I think I've seen every single episode of it. :') Bab5 was pitched to Paramount, which turned it down, then allegedly stole the idea to make DS9. Killing off the Tril in season six was pretty heartless, and I never liked the replacement. Also didn't much care to have Worf around. Didn't like any of their political soapbox episodes. Liked the revisiting of the Tribbles (original series) episode.
The original series was pitched as Wagon Train in Outer Space.
Voyager was Gilligan's Island in Outer Space. And Gilligan's Island was a better show. And of course, they had to get back at the end of the seventh season, and that was a kind of "what an amazing escape" kind of moment. Completely expected of course. :')
DS9 was a ripoff of B5.