Hah, the video on IGN has grainy Playstation 1 looking graphics. I'll sign the petition anyway. I wouldn't worry though, The Conduit is coming out soon and it will stomp this game both grapically and playwise, plus it's being published by Sega. There are actually a bunch of promising looking Wii titles coming out this year so far, most of which are from third parties. If Nintendo plays it's cards right, this year will be the transformation for the Wii like the DS where it took a couple of years until more third parties started making good games and then by 2010, a new Zelda will be out.
There are numerous M rated games on Wii, and some of 'em have been quite successful (i.e. Resident Evil, Godfather, Tom Clancy, and Call of Duty).
Don't forget what has become one of the most controversial games of all time: Manhunt 2. Mad World isn't even out yet and it's already being banned from Germany. Plus No More Heroes is one of my favorite Wii games, awesome violence.