Well, they are not that bad
I have to admit, they don't hit very often, but that's not what they are supposed to do (sounds strange (?))
They keep enemies in check, fly around everywhere, pollute the universe, sometimes hit people in the rear or when they vent flux etc
But mostly they are a way of zoning enemies, most fighters and frigates while have to outmaneuver them, which gives you the chance to hit them
that's y you have so many of them... launch 3 at a time etc...
if you have 4 or 5 of those launchers in your fleet that really ads up to alot of missilles flying around
and it's a good way to shoot down some of the retreating ships ^^