Its a military simulation not a fast paced action FPS, the controls are perfect once you understand them and get used to them.
Excuses excuses. The controls are terrible, awkward, and incomprehensible when you first play. And the demo runs like utter stuff; I can play Crysis (old, yeah) on high, and I can barely play this on the lowest resolution with the lowest graphics, and it ends up look like Half-life, but extremely blurry. Oh, and dem voice actors; enemy MAN at LEFT.
I've played games with incomprehensible controls (Universal Combat, everything made by 3000 A.D./Derek Smart), and even I can vaguely understand the reason behind the terrible controls (space/infantry/vehicle combat simulator). Arma is a FPS, it shouldn't have terrible controls.