As you can see here, the best selling versions of Guitar Hero games are usually on Wii and PS2.
Why is it then, that the Wii/PS2 versions of Guitar Hero: Metallica will launch more than a month later than the 360/PS3 versions? It was exactly the same thing with EA's Rock Band, for which the Wii/PS2 versions launched in the ridiculous date of December 18.
My Mario Kart Wii friend code: 2707-1866-0957







