Urza Jaddo overacts quite a bit.
I looked over the writing credits a few days ago, and I realized that Larry DiTillio and Peter David led the credits at seven episodes and three, respectively, in terms of people who weren't JMS writing.
As Maneth said upthread, it's interesting to learn more about the various races. Centauri society is an interesting one. Not that there any UNinteresting societies in the Babylon 5 universe. The Centauri appear to have some very rigid social rules. I'm vaguely uncomfortable with the idea that cultures who embrace concepts like blood oaths (Narn) and duels to the death (Centauri) are technologically advanced enough to be space-faring (and then some). But, I'm never entirely sure about the Centauri. It is possible they are trying to recreate some former glory and have gone back to duels and such in the somewhat recent past. It's hard to think of them as anything but imperialistic, but perhaps they enjoyed more progressive periods in their history.