In football you throw the perfect spiral and score. Really the motion is compareable to pushing the button in terms of what it does. The equation in the program determines how good the pass is.
But in baseball, you would push a button and use the + thumb pad (or whatever shape your controller has for the thumb pad) to adjust the height of the swing. This is a result of the equation plus user ability.
With the Wiimote . . . will you be able to miss the baseball or tennis ball or whatever . . . like you could with the traditional controller?
With the thumb pad, you might swing too high or too low. Is the sensor able to detect height? Can you miss? Or will missing be a computer algorithm result rather than your own mistake?
Hope this makes sense.