Okay, So I'm hunting for Wii games (Again.) And I am compiling a new list of what to get, here is what I've got so far...
Madworld (This game, Is bloody amazing)
New Super Mario Bros WII
Xenoblade Chronicles
Red Steel 2

Wii sports resort - simple yet amazing when it comes to execution, but to see its full potential you need a second player and two controllers with motion plus

Rayman Origins
No More Heroes 1&2

Metal Slug Anthology

Sonic Colours

House of the dead 1+2
(Do not get overkill on Wii because it's much worse compared to the PS3 version)

Metroid Prime 3, and if you can find it, Trilogy.

Last Story, Pandora's Tower, The Conduit 1 and 2 (if you enjoyed Red Steel 2, you'll probably enjoy these FPSes too), Red Steel 1, No More Heroes 1 and 2, Super Mario Galaxy 1 and 2, Zelda Twilight Princess, Zelda Skyward Sword, the Kirby games, Punch Out, Sin and Punishment Star Sucessor, Donkey Kong Country Returns, Goldeneye (be aware that there is an improved version for the Xbox 360 and PS3), Okami, Pikmin 1 and 2, Metroid Prime 3 Corruption, Metroid Other M, Epic Mickey, Resident Evil Umbrella Chronicles and Darkside Chronicles (i'm not sure if these are the correct names), Mario Strikers Charged, Fire Emblem Radiant Dawn, Super Paper Mario.

Also some more good/great games:

Resident Evil 4: Wii Edition
Tatsunoko vs. Capcom: Ultimate All-Stars
Zack & Wiki: Quest for Barbaros' Treasure
Monster Hunter Tri
Pinball Hall of Fame: The Williams Collection (there's a better version for X360/PS3)
Mario Kart Wii
Muramasa: The Demon Blade
Trauma Team
Metroid: Other M (mixed but generally positive reviews)
Tales of Symphonia: Dawn of the New World (incase you like the Tales series)
Naruto Shippuden: Clash of Ninja Revolution III (for Naruto fans)