MadBirdCZ,
If it is less than 10 soties for you, well, boffo.
But that is not the case for almost all of the players in AH, and no, it doesn't matter what they fly.
I don't spend much time in Spit IXs and no time at all in N1K2s or La-7s, yet a 6 perk point sortie is a very, very rare thing for me.
Mossies aren't easy to use, and there isn't much reward. You get less than a point for shooting down a P-38L, which is much, much better.
Stop using yourself as the "average", you're not. I'm not even the average, its below me too.
I seem to recall that somebody calculated that it took about 16 sorties for the average player to earn an F4U-1C.