Whenever Season 5 is brought up, the whole Byron storyline takes center stage. The thing is though was that storyline was only, what, the first 8 episodes of the season. The rest of the season was about the whole Centauri republic and the consequences of what happened on that planet in Season 4. That was really strong stuff, and definately makes Season 5 worth watching. If it was just about the Centauri, I would probably rank it as my third favorite season behind Seasons 3 and 4.