Originally Posted by KarTek

Not sure it's what you're looking for but a typical helicopter with a teetering rotor system (bell jet ranger, robinson r22, r44, etc...) you can't roll either right or left at all and still fly in a straight line, unlike a fixed winger. Now, that said, you can fly sideways to a degree (some more than others) and the fuselage will be tilted.

Pitch up and down is complex as well because you can gain or lose altitude while flying level (pull/release pitch) or at an angle aft/forward cyclic.

The helo just has a whole unique set of flying parameters. Typically, when I fly, I shoot for keeping the machine level fore and aft unless flaring for a landing.