Not to be confused with the other thread that ranks on critical reviews...
http://www.digitpress.com/forum/showthread.php?t=109135
My vote so far goes to...
Metroid Prime 3- an awesome game, without any exceptions. A must have for all Wii owners.
And a few others I've played...
Ghost Squad (cheesy arcade Virtua-Copesque game)- Honorable Mention
Wii Play (for the Tank game alone)- Honorable mention
Wii Sports (great party game- but I'm sure anyone who has a Wii already knows this)