I think that is what made Babylon 5 such a great show. He had a story arc and set it in a 5 season time frame with a decent ending. It probably made it tougher for Crusade to get traction, although a better tie-in to Babylon 5 might have helped. One site to bring back memories is the wiki:
http://en.wikipedia.org/wiki/Crusade_%28TV_series%29 and another site with some interesting insights is:
http://tvtropes.org/pmwiki/pmwiki.php/Series/Crusade?from=Main.Crusade