If B5 had run as the writer intended, it would have been much better. Series 4 was really 4 and 5 compressed together and series 5 was an add-on afterwards (except for the final episode, which was filmed during series 4). It was still superb because of the writing and because it was written as a story (as opposed to a collection of episodes), but it faltered a lot at the end (because the writer had to compromise the story).
DS9 surprised me...Trek without Enterprise? Trek not on a spaceship at all? That didn't sound good. It was, though, very good indeed. Some story arcs, some meatier storylines, some good characters...all good stuff. They had time for some more fun - remember "Trials and Tribble-ations"?
I like them both and I think they're dissimilar enough to make a straight comparison difficult.
Farscape...no. I liked the idea, but after the first few episodes I realised that the people making it couldn't decide whether it was intended for children or adults and therefore failed to make it for either.
BSG revised looks good so far, but it's a shame that they took an old program and over-wrote it.
ST: Enterprise...I liked it as long as I could manage to forget that Star Trek ever existed, because Enterprise was one long continuity error. Oh, and that last episode. I can only assume that they had a tantrum and wanted to try to ruin everything. An hour of the old BBC test card would have been better. A black screen and someone chanting "Lalalalalalalalalalalalalalalala" for an hour would have been better. If anyone decides to watch ST: Enterprise, they would be well advised to avoid watching the last episode and assume it ended on the episode before, with Archer persuading the delegates to return to discussing the alliance (that becomes the UFP).
Although I think Red Dwarf was the best sci-fi
Smoke me a kipper. I'll be back for breakfast.