If you're not using rudder, you're really not controlling the plane. It sounds like you're flying out in a field which is great if you can. Chances are it doesn't matter how or where you land there. Flying on a regulation field one of the first goals of learning to fly RC is making straight and level shots down the runway, and then landing in the middle of said runway. I haven't seen anybody do it yet consistently without using rudder. When learning aerobatics, you'll rarely make perfectly straight loops without some rudder control, and uplines and downlines will rarely come out right either. Even in just flying ovals, the rudder lets you put the airplane exactly where you want it to be and then to keep it there.