a) Primarily boresight weapons on a War level ship means you won't have enough FAPs spare for init sinks, unless you're playing at War level
b) Slightly below average weapons capability for a War level ship
c) Slightly below average hitpoints with no extra trait defences (Dodge, AA, inteceptors, GEG etc)
d) Horrible mini
(a) and (d) are by far the biggest reasons. But even if not for them, it is below average in every area except turns.
Bry is right about Claweagles too, and yeah I forgot about them. Though, they are best used as a "distraction" than an actual ship-killing threat. People get very scared of them, they are not actually that effective, but people are so scared that they are almost alwys primary target.