Yes but B5 had and was a mayor challenge on season 1, it have to introduce you on his amazing universe. Ships, characters, races, plot, all the universe.
OTOH on crusade we already have the universe, the season 1 have to introduce the characters and the plot.
If you see the firsts episodes you thought that the crew of the Excalibur will search for the cure for the Drakh virus all the 5 years.. IMHO that wasn't a interesting idea.
Five years and the human race will die, generally the series last five years.. so you thought and feel that they will find the cure on the last minute and save the day. Nothing fancy, all very predictable. At least that was what i felt.
And there was another thing. The Drakh plague was never mention before on B5 (in episode such "The Deconstruction of Falling Stars", or "Sleeping in Light", in which they mention fact from the future, like teleph war, but there was no thing such a Drakh virus)
So you thought the it was a "last minute invention".
The music was another wrong choice. -Norbert- said it all already.
The poor quality of the CGI.
All the conflicts with TNT (uniforms, order of the episodes, etc)
The characters wasn't very charm and charismatic, and the performace of the actors were really poor, except of course of Gary Cole (Captain Gideon) Tracy Scoggins (Captain Lochley) Peter Woodward (Galen) who were outstanding.
The main ships design hasn't the rotaion section, I know, it was ISA, they already have the tech, but i always thought that was a bad idea. Maybe it could work on a different design. Tim Earl work on the Excalibur, don't get me wrong his work is just amazing.. but he did not reflect that on the Excalibur.
That's why, that are my reason of why Crusade didn't work, it was a sum of errors. Everytime I thought about it I felt the same, It's really a shame. May have been a great show, a great spin-off. But it didn't have the magic of B5, at least of this 13 episodes.
It have good thing like Shadow hybrid and "what happend with the Cerberus?" plot. Teleph war flashbacks were good one too. And the connection with the EA government and the Drakh virus appeared to be good plot too (the Pro Zeta corporation was a dark secret, really good one).
And JMS said the the crew will find the cure on the plague on season 2.. and they somehow find some very dark secret on the EA government and became on traitors to EA..
I said again. The show didn't have the chance to show his potential. It's shame.