Babylon 5 and Earth Final Conflict.
Star Trek on the other hand could have done without its reincarnation as Deep Sleep 9 or Voyager.
They milked a dry cow with those two.
Crusade.
I didn't like either of those when they started, but I think they got much better.
In DS9 Sisco started as a wimpy character, his son was boring, and the Bjorans were just plain annoying. Quark was a good character, but he couldn't carry the show. About 3 years in they had Sisco shave his head and act more Hawk from Spencer for Hire, brought in Klingons, Romunlans, Jem Hadar and galactic war, and gave them the Defiant, and it got much, much better. Gol Ducat developed into a pretty good character too. Even Jake was more watchable with Quark's nephew as his buddy. It ended up being my second favorite of the Star Trek series after the original.
As for Voyager, the addition of Seven of Nine made the show much more watchable, in more ways than one.