There are lost of great games for the Cube that people missed out on because either they thought Nintendo games are kiddy or not tehhardorez!1!. Grab a wavebird and check out these games:
Super Mario Sunshine - Not as revolutionary as Mario 64 was but a great platformer. And it's very difficult as you get into the later levels.
Star Wars Rogue Squadron II: Rogue Leader - Awesome action flight game. I've yet to see developers create a better looking game on the Wii than Rogue Leader. And it was a launch title!
Pikmin 2 - Great addictive RTS style game. I preferred the sequel because they got rid of the time limit.
Eternal Darkness - Great mature storyline and the sanity effects still creep me out.
Legend of Zelda: The Wind Waker - Great art style and the game play is mazing. If they didn't rush the game and left out those 2 dungeons it would have been my favorite Zelda ever.
Metroid Prime - My favorite game of last gen, everyone should play this game. Amazing beautiful designed worlds, satisfying game play challenging bosses. Just one of the greatest games of all time!