What?! Huh?!
DS3 has 7 analogue DOF readily accessible. 9 if you count shoulder buttons. The MS effort (freestyle) had 2, maybe 4, not sure. Wii has 6 I think, pitch, yaw, roll and X,Y,Z positioning.
Is DS3 a Wiimote replacement? No, it's a different design with different strengths. Will it do as well as Wiimote at a Tennis simulator? Nope. Will it do a better job of providing gamer interaction on arcade games like hack-n-slash or footy? Sure thing! Will it let you control a plane by rotating the controller and also control targetting of weapons with the L and R sticks? Absolutely
As for accuracy, as I pointed out already, if Wiimote can do it, so can DS3. They're both using internal MEMS tech to get the pitch, yaw and roll values. There's no reason yet to think DS3 will be worse in that respect. We don't know how either has implemented it and haven't software to test and compare.
Now quit the comparisons and revert to talk about how the addition of 3 analogue inputs, tied to intuitive/natural motions, can contribute to PS3 games or not.