Since when was GOW 3 considered a system seller?

[aavidbacon]

I bougth a PS3 mainly because of God of WAR 3. It was a system seller to me, so ...
And about the sales of the first two, this gen is moving more software than last. Take a look at the numbers and you´ll see that some games have almost the same amount of sales than gen with way less userbase. I´m expecting numbers above 4 mln for LTD, in the GoW3 case.