I agree, when I first came to this gamer after playing OFP I hated the controls and wished they had carried across the controls into ArmA, but once you get used to them they work a treat ... even better than OFP imho.
Also the aircraft shouldn't be flown with a keyboard and mouse, mainly because a keyboard can't detect the pressure you press on a key so it will just spaz out if you press it. I find using a PS2 like controller works wonders for flying ... as long as you watch where your going :P