Devil's Advocate:
The only reason I think the Wii is being singled out because it doesn't have a great new ip out.
Sony has put out Uncharted, Heavenly Sword, Folkore, Motorstorm, Resistance, etc launched. MS has launched Gears, Mass Effect, Bioshock, Viva Pinata, etc.
The is the only reasoning I think of to warrant the heavily rely on sequels.
/Devil's Advocate out
Seriously, this guy is dumb. The commentors are even funnier.