I own all the games below, unless noted otherwise (my current Wii game collection is at 36) and my rankings are in order:
Love it:
1. Metroid Prime 3: Corruption
2. Super Mario Galaxy
3. The Legend of Zelda: Twilight Princess
4. Okami
5. Super Smash Bros. Brawl
6. Mario Kart Wii
7. Battalion Wars 2
8. Resident Evil: The Umbrella Chronicles
9. Mario Strikers Charged
10. Excite Truck
11. Guitar Hero III: Legends of Rock
12. Ghost Squad
Like it:
1. Super Paper Mario
2. Geometry Wars: Galaxies
3. Metal Slug Anthology
4. Trauma Center: New Blood
5. Call of Duty 3
6. Link's Crossbow Training
7. The House of the Dead 2 & 3 Return
8. Wario Ware: Smooth Moves
9. Wii Fit
10. Wii Sports
It's Okay:
1. Marvel: Ultimate Alliance
2. Blast Works: Build, Fuse, & Destroy (I've only played through the campaign/arcade portion of the game and haven't touched the online portion yet)
3. Big Brain Academy: Wii Degree
4. Rayman Raving Rabbids
5. Endless Ocean
6. Super Monkey Ball: Banana Blitz
7. Elebits (I don't own it, but the hour I played of it seemed okay)
Not so Fond of (only rented or played a friend's copy):
1. Nights: Journey of Dreams (even with a classic controller, the control was frustrating for me & the level design wasn't great)
2. SSX Blur (I know a lot of people were able to adjust to the control, but 4 days of playing it still didn't help me figure it out)
3. Mercury Meltdown Revolution (too frustrating for me, when compared to Super Monkey Ball)
Own but have yet to play:
Bully: Scholarship Edition
Fire Emblem: Radiant Dawn
Harvey Birdman: Attorney at Law
No More Heroes
The Godfather: Blackhand Edition
Tom Clancy's Splinter Cell: Double Agent
Trauma Center: Second Opinion
Zack and Wiki: Quest for Barbaros' Treasure
A lot of people seem to dislike Super Paper Mario and I guess that's due to it's change from it's RPG past to an action/adventure game with RPG upgrade elements, but I thought it was a very fun game with a lot to do (Getting all the pixls, finding all the cards and completing all the recipes, the arcade games and going through
).
Also, I know Metroid Prime 3: Corruption wasn't a huge seller/blockbuster like SMG & LoZ:TP, but I wish it had gotten more love on peoples' lists here and better sales in general. I think it executes the wii control scheme very, very well and pulled me in to play it through 3 times (once on each difficulty) to get 100% completion on the game.