I express my thoughts with certain modifiers for a reason. And Gamecube certainly has an OS. It might not be a WinXP, but it's an OS. Remember, MS-DOS was an OS. You don't have to have a fancy GUI and an integrated web browser to be an OS.
New Blitz video up on 1up:
http://www.gamevideos.com/video/id/5864
I think this pretty much looks like the PS2 version. Am I right?
I think this title was cancelled for the Wii.