It can be good.
What I like about the Wii isn't so much motion, but that I can have a greater amount of distance between my hand than I would an ordinary controller. Wiimote in one hand, nunchuck in the other... I can actually stretch out. It's relaxing XD
With the Wii, some stuff was implemented very well and other stuff was lazy. Doesn't need to compete with traditional input devices, certain games are well suited to one type of controller over the other. They complement each other.