The first season can be hard to slog through due to the alternating wooden performance / theatre extreme facial expressions of the principal character.
I had really enjoyed the 90 minute pilot (with a different first officer) and was surprised how stiff he was when the first season.
While there’s a lot of important set up in the first season, if it’s too much of a barrier that you’re not watching B5 at all, better to skip ahead to season two.