Babylon 5's plot and planned-out story arc is simply incredible. It just suffered from a low special FX budget especially in the early 1-2 seasons. Compare it to the more recent "Unfinished Tales" where they actually used very, very good CGI (some of the best CGI I've ever seen; compared to bad BSG CGI for example).
J. Michael Straczynski's handling of dialogue was also rather odd. His characters have an unfortunately tendency not to converse with each other but to deliver themselves of portentous and pretentious speeches about life, fate and destiny. Compare this with the natural, flowing dialogue of George RR Martin in
Game of Thrones, for example, and the artificiality of Straczynski's dialogue becomes painfully obvious. I mean, who actually speaks like that? The conception of
Babylon 5 was awesome, but the execution of that plan was suboptimal.
"Politics is the art of looking for trouble, finding it everywhere, diagnosing it incorrectly and applying the wrong remedies." - Marx (Groucho)