What has been the Defining/Most Hyped game for each System this Generation?

[Xponent]

Games which most define their respective consoles.

Wii: Wii Sports
Xbox: Halo 3
PS3: At this very moment, nothing. Perhaps GT5 once it is released.
DS: Nintendogs
PSP: GTA Liberty City Stories

Most hyped.

Wii: SSBB
Xbox: Halo 3/GTA4
PS3: GT5/GTA4
DS: Pokemon Diamond/Pearl
PSP: ......?