in any organisation (RAF included) you're going to get nobbers and walts at all ranks, DK338, it's unfortunate that you had a whole course of them. But as maple states; there are a lot of good people out there doing a job for nothing in return except the satisfaction of a job well done.
I'll state my case again
a) a volunteer is worth 10 pressed men
and
b) this situation of nobbers and walts will only be sorted by addressing the recruitment and training of VR(T) personnel by the top brass - but that's not going to happen is it?