I'm pretty sure the original intent of the Wiimote was for it to be a direct pointing device(aiming physically with the Wiimote at the screen) and not a relative motion device.
No matter what the original intent was or wasn't, it's an indirect pointer. Trying to use it otherwise won't get a player anywhere.
And from my experience it's a damn accurate and comfortable one at that. Resting my hand on my lap, just moving my wrist slightly to control the pointer on the screen is still the most innovative and cool thing I'be experienced in game controls during the last decade. I'd really like to understand how people can prefer gamepad controls for aiming in first person games, because I've yet to experience anything as natural feeling (provided the turn speed isn't sluggish) except for mouse aiming...