Why Babylon 5's Victory-class destroyer struggles across universes

How would the Victory-class destroyer from Babylon 5 scale against ships from Star Trek and Star Wars?

It is expected to struggle if it lacks conventional shields, but the comparison is provisional because its identity and protection are recalled uncertainly.

The comparison gives the ship a length of roughly 2,990 metres, making it large by Star Trek standards and substantial beside many Star Wars combatants. Its protection is assessed provisionally because the class is initially confused with the White Star and the presence of shields is recalled uncertainly. Without conventional shields, it is judged vulnerable in settings where such protection is important even outside combat. An energy-reflective coating also says little by itself about resistance to weapons such as phasers, which are treated here as particle beams. The resulting analogy is a Vickers speculative cruiser with many striking features but the character of a test bed.