But, I think we've all seen that a Vorlon transport can shred a Battlecrab to pieces in the show (okay, maybe a small one). But the Shadows exist in far superior number.
As noted - in game terms that was probably a destroyer....
Nonetheless, it's still highly improbably; an average volley from a Destroyer's gun should overwhelm a Shadow Ship's ability to dissapate energy (shields) and actually do a bit of damage to the hull. But a 'bit' is limited in the extreme. To kill a ship in one turn would require something in the order of 29-30 hits off the beam, given average rolls.
Given the scene in question, though, it looks more like the shadow ship is hit, pinned by the beam briefly, and takes a sustained volley of fire.
Bear in mind, as with all ship-to-ship engagements, that the relative power of warships varies as dictated by the needs of the plot.
I actually remember reading that Vorlons ships are superior in quality, and Shadows in quantity though. Alas, forgot where.
No idea. The shadows are definitely the older of the two races, though.
I always thought it would be interesting to buy turns for the shadows rather that ships for a battle
Don't quite follow. Care to expand on the comment?
If anything, what annoys me is the ISA.
"We refuse to choose between the Shadows and Vorlons! (Well, other than the fact that we'll promote the use of Vorlon tech, and restrict/ban the use of Shadow tech...)"
Two reasons one good, one not so good but probably more important:
1) There is a slight moral argument in favour of Vorlon hardware; Shadowtech tends to be more invasive; requiring surgical and biochemical modification of users, and in extreme cases permanent bonding of sentient beings into the ships.
2) The IA already has a good grounding in Vorlon Technology (based on the principles given to them by the Vorlons themselves)...so by preventing anyone researching Shadow technology, they maintain a commanding lead over any possible rival. Equally hypocritical, but more expected from politicians.