Third Party developers just don't understand the motion controls. They think everything is big wacky arm motions and Wario Ware minigames. The games that best utilize the Wii-mote nunchuck setup are as follows.
1. Okami (Port)- As a port this may not be what you expect. But the wiimote is far more suited to this game than the PS2 could ever be. The nunchuck controls movement, wrist flick to use a tackle. Where the game really shines is in the drawing mechanic. In the PS2 version this was a long tedious process that broke up fights with long still frames where you try to draw symbols using a dualshock controller. Okami for the Wii uses the point and click Wiimote. This means that the symbols are drawn lighting fast and don't break up combat. In no time your flawlessly fitting brush techniques into combos and mowing down imps by the score.
2. Mario Galaxy- Only motion is a quick wrist flick to spin. Point and click with the Wii-mote merges flawlessly into gameplay. Perfect use of the Wii-mote.
3. Metroid Prime 3 - Point and click wii mote control for aiming and only a quick wrist flick for the grapple. Still had smooth control for simple grab and pull and twist mechanic that used the motion control without being slapped on.
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That is how you use the motion control. Third party developers just don't understand that there is a legitimate and mature way to use the Wii-remote that doesn't involve big goofy flailing motions. The Wiimote-nunchuck setup has a perfectly serviceable number of buttons. (4 directional keys, A, B, 1, 2, Joystick, Z, c, Motion on Wiimote, Motion of Nunchuck.) and the capability of the Wiimote to actually aim is where the system can really shine is developers would just get it through their thick skulls that not everything has to be based on Wii-sports.