Did not played a lot of GameCube games, but will give my top (of the ones I played) in no order:
Super Mario Sunshine-Love it
Paper Mario The Thousand Year Door-Best Mario story
Mario Kart Double Dash
Super Smash Bros Melee-My favorite one
TLOZ: Twilight Princess-even if I played firstly on the Wii, eventually bought the game on for the GC
TLOZ: The Wind Waker
TLOZ: Ocarina of Time Master Quest
Metroid Prime
Metroid Prime 2 Echoes
Resident Evil 4-Played on Wii, but it is a GC game
REmake-Same as 4
Final Fantasy Crystal Chronicles-Hopefully, people that have not played the game, try it with the HD version coming soon.
Edit: Forgot Luigi's Mansion.
Proud to be the first cool Nintendo fan ever
Number ONE Zelda fan in the Universe
Prediction: No Zelda HD for Wii U, quietly moved to the succesor
Predictions for Nintendo NX and Mobile