Well, I have had my Wii for a year and a half and I have spent a lot of hours on it.  So, just for the fun of it and because I am curious to know yours, here is my top 5:

1.  Endless Ocean Blue World.  This game did everything right for me.  It is very relaxing.  I can explore as much as I want to and the environments and animals are beautiful.  The best 40$ I have ever spent!!!

2.  Silent Hill Shattered Memories.  I am a fan of survial horror games and this one took me in another direction.  Superb graphics and story.  The gameplay was perfect.

3.  Cursed Mountain.  The environment and atmosphere were awesome.  The whole buddhist theme completly took me in for the ride.  The locations were fun to explore.

4.  Final Fantasy Crystal Bearers.  I am still playing it and as I am nearing the end, I take a pause to let it all sink in.  The bottom line, not a dull moment in my playing time.  And no frustration at all.

5.  Dead Space Extraction.  What a fun game.  Too bad it is so short.  But the graphics and gameplay were excellent.

Honorable mentions (games that almost made it): Ski and Shoot, Little King's Story, Indiana Jones and the Staff of Kings, Ghostbusters and Super Mario Bros Wii.

One that will be right up there when I do get it:  FRAGILE DREAMS: FAREWELL RUINS OF THE MOON.

Now, let me know yours.  And please, let's keep this thread free of judgments.  This is just for the fun of it.
Thanks!

1. Super Smash Bros. Brawl
2. Super Mario Galaxy
3. Metroid Trilogy
4. LoZ: Twilight Princess
5. The Conduit
6. New Super Mario Bros. Wii

Red Steel 2 would probably be on that list, but I don't have it yet.

1.) Super Mario Galaxy
2.) Mario Kart Wii/Fire Emblem: Radiant Dawn/Wii Sports Resort (3-way tie)
3.) Metroid Prime Trilogy/Super Smash Bros. Brawl/Tatsunoko vs. Capcom: Ulimate All Stars (3-way tie)
4.) de Blob
5.) No More Heroes

Very honorable mentions: New Super Mario Bros. Wii, Resident Evil 4: Wii Edition, Endless Ocean: Blue World, Excitebots: Trick Racing, The Legend of Zelda: Twilight Princess

EDIT: There were some titles I forgot

So far, the 5 best titles I have played are:

1. Super Mario Galaxy
2. Super Smash Bros Brawl
3. Muramasa: The Demon Blade
4. Tatsunoko vs. Capcom: Ulimate All Stars
5. New Super Mario Bros Wii

Melee?

1. Super Mario Galaxy
2. No More Heros
3. De Blob
4. Muramasa
5. LoZ TP

Man, I'm just way too tired today.  Brawl is what I meant....

1 - New Super Mario Bros Wii
2 - Zelda Twilight Princess
3 - Mario Kart
4 - Wii Sports

5 - ...a lot of others. Galaxy, Brawl, Wii Sports Resort, Super Paper Mario, Tatsunoko Vs Capcom, Muramasa, Metroid Prime 3, Endless Ocean, Resident Evil 4, Mario Strikers (great game! must play again!), Punch Out...

Actually, the few games I have that I don't like vey much are Link's Crossbow Training and Wii Play... all the others could fit in my top 5.

1. Mario Kart Wii
2. Super Mario Galaxy
3. No More Heroes
4. The Legend of Zelda: Twilight Princess
5. Dragon Quest Swords: The Masked Queen and the Tower of Mirrors

I wouldn't call these the 5 best games on the Wii, but they are the 5 best of the ones I've played:

1. Super Mario Galaxy: I don't even think I need to explain why this game is so great.

2. Super Smash Bros. Brawl: This game is epic. The insane amounts of characters and content is staggering. The only fault is that it isn't enough of a change from Melee (in my opinion), but there's no need to change a winning formula.

3. Scarface: The World is Yours: Maybe I'm one of the few people who would include this game in such a list, but I loved it. It was the first Wii game I had where third person shooting was featured, and it was amazing. It's a huge game with tons to do and lots of fun to be had.

4. New Super Mario Bros. Wii: I'm a fan of both 2D and 3D Mario, but there's something so very charming about a sidescrolling Mario game. It's just simple, sheer fun.

5. Link's Crossbow Training: I know that a lot of people hate on this game if only for the fact that the Zapper is useless and the game itself is like...2 minutes long. Still, it didn't waste time. It led you from challenge to challenge, and truly tested your skills. I spent hours aiming for the highest medals in the game.