I started watching in 1994. My previous exposure to SF on TV was Star Trek: TNG.

I fell into the novel structure of B5 and ... at last! Everything I had wanted from a genre TV show! Episodes with great woogy moral issues that weren't resolved in a trite manner by episode's end! Choices that came back to bite you in the ass later, in ways you didn't think of at the time. Characters who were morally complex.