Since when was GOW 3 considered a system seller?

[BenVTrigger]

Actually out of exsclusive games we have only seen ONE true system seller per system. MGS 4 for the PS3 and Halo 3 for the xbox 360. God of War itself won't be a system seller but a larger good library will be. The more high quality games in a library the more enticing the system is.