When I was looking over my Wii collection, I realized I've barely played enough first party Wii games to even make this list. And a few of those I actually really dislike, so that narrows it down even further. Despite all that, I can STILL find 10 games I'd put higher than Wii Sports. Screw the "importance vote," it's not a very fun game. Anyway, here's my best attempt at a top 10:
1. Metroid Prime Trilogy
2. Super Mario Galaxy
3. Fire Emblem: Radiant Dawn
4. Super Mario Galaxy 2
5. Super Smash Bros. Brawl
6. Mario Kart Wii
7. Super Paper Mario
8. New Super Mario Bros. Wii
9. Metroid: Other M
10. Punch Out!!
Honorable Mention: Kirby's Return to Dreamland
If only Metroid Prime 3 counted, rather than all 3 Metroid Prime games, it would fall all the way behind Super Paper Mario. The first two games (Particularly MP1) with Wii controls vault it all the way up to #1.
Played Twilight Princess on Gamecube, so I don't really count that. Wario Land Shake It, Kirby's Epic Yarn and Fluidity are all overrated as hell. Did not like any of them. Animal Crossing: City Folk was too much like the DS game, which I had already played to death. Pokemon Battle Revolution was the biggest waste of money I made this gen.
My wishlist/list of shame: Xenoblade, Skyward Sword, Last Story, Sin & Punishment 2, Donkey Kong Country Returns, Rhythm Heaven Fever, Excitebots, Excite Truck