B5 top for storylines
I watched B5 from day one, at first it was because it was a new sci-fi series and I was open minded to give it a go. I thought the acting was a bit poor, and some of the sets looked like they were made of cardboard, but what impressed me was the way the story-lines were so intricately put together.
Remember the incident with Babylon 4, how it mysteriously re-appeared during the first season, and then a 3rd season episode involved Sheridan, Delenn, and Sinclair travelling back in time to steal it and inadvertantly causing its appearance 2 years earlier, that blew my mind away with the level of continuity involved. Especially when in one part, Sheridan accidently slips about 20 yrs forward and meets a much older Londo. The next 2 seasons of B5 basically showed the events that led up to Londo becoming emperor and Sheridan leading the alliance of the alien worlds.
You see thats one problem with Star Trek, they constantly travel through time, but if they travel into the future and see something they dont like, dont worry, they'll just change histoy and the future they saw wont happen.
The timeline in Babylon 5 was consistent, story-lines lasted for more than 1 episode, old characters re-appeared and had lasting impact, the aliens like the shadows and vorlons actually looked alien instead of just having ridges on their foreheads and pointy ears.