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I agree with what has been previously said in regards to ork shooting, best way to deal with it imo is to just have a bigger bullet spread when on full auto and an initial small area a bullet can hit with the first shot.
The latter point I think is very important as otherwise if the first shot is pin point accurate you will just end up with a horde of boyz on a ridge line taking pot shots at marines with single shot bursts rather than charging into the fray to, "hit em humies wiv der choppa's"
So it looks like the classes for the Orks are:
Meganob, Stormboy, Loota, and Mek. Then the F2P Boy.