I'll only count games I haven't beaten because if I started listing all games I haven't completed (as in finished all bonus stuff) it's gonna take a while.
Wii:
Will finish for sure: Epic Mickey, Kirby's Epic Yarn
Probably won't ever finish: No More Heroes, Tenchu: Shadow Assassins, Red Steel, Resident Evil: The Dark Side Chronicles
A special mention to Wii Play since I never played it, most probably never will.
PS3:
Will finish for sure: Ratcher & Clank Future: A Crack In Time
XBox 360:
Will finish for sure: Lost Odyssey
PC:
Will finish for sure: Batman: Arkham Asylum
Signature goes here!