You really shouldn't do a ratio between America's pre-orders and WW week 1 sales because there's no record of pre-orders for the rest of the world, which means the ratio is distorted and doesn't truly reflect the pre-order to Week 1 sales sell through.
For instance Madden's ratio looks like crap compared to Mafia II's. But in the America pre-orders vs America week 1 ratio Madden's ratio is better than Mafia II's. Clearly Mafia II had reasonable pre-orders in other countries, whereas Madden probably had almost none.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
