i was in a group fight the other day and i was behind a bomber. i shot a paralyzer then shot a sidewinder at the target. i heard both missiles fire but never saw them.
the problem comes from thrusting and engine killing, which we all agree is the typical way of fighting. from my experience your current forward momentum affects the speed of the missile, nomatter which way your ship is pointing. this is why missiles work best in jousting situations, because your both thrusting at each other causing the missle to probably, after both parties speed is considered, be traveling faster than cruise speed.
back when i had missile turrets on my destroyer i noticed this tremendously as i was thrusting one way shooting missiles behind me, the missiles were speed was affected by my forward momentum so the missile looked like it was going about 5ms.
the increase in speed for missiles was my thought on how to counteract this hinderance. in all actuallity the missles will be going slower than posted due to engine kill aside from jousting.