1st Party Core Wii Titles. Your Take.

[theRepublic]

First party only? Ok. There are a bunch of good third party games, but fine.

In alphabetical order:

Art Style: Orbient (Not for everyone, but worth a look)
Fluidity (Published by Nintendo, fantastic puzzle platformer)
Donkey Kong Country Returns
Kirby's Epic Yarn
Mario Kart Wii
Metroid Prime 3: Corruption
Metroid Prime Trilogy
Metroid: Other M (Game play is generally fun, but has its issues. If you are not a Metroid fan you can ignore the story and it makes the game better.)
New Super Mario Bros. Wii
Super Mario Galaxy
Super Mario Galaxy 2
Super Mario All-Stars (If you don't have it on another console)
Super Smash Bros. Brawl
The Last Story
The Legend of Zelda: Skyward Sword
The Legend of Zelda: Twilight Princess
Xenoblade: Chronicles
Wii Sports
Wii Sports Resort