I've finished just about every game in my Cube collection

Metroid Prime (on Hard mode no less)
Metroid Prime 2 Echoes
Super Mario Sunshine
Super Smash Bros. Melee (all characters, maps, 270++ trophies)
Luigi's Mansion
Star Fox Adventures
Donkey Konga (unlocked & finished all songs)
Donkey Kong Jungle Beat
X-Men Legends
Beyond Good & Evil
Resident Evil
Resident Evil 2
Resident Evil Code: Veronica X
Resident Evil 4
Metal Gear Solid The Twin Snakes
Eternal Darkness
007 Nightfire
007 Everything or Nothing
007 From Russia With Love

also I finished DonMiguelito's copy of

- Star Wars Rebel Strike
- Tony Hawk's Underground

I did not finish

F-Zero GX (Too darn HARD!!)
X-men Legends 2 Rise of Apocalypse (keeps on hanging in the last level )
Star Wars Jedi Outcast (I used cheats)