Almost as much? Dude, it sold 103,634 more in two weeks than Ninja Gaiden has since March.
Fable 604,084 (released sept 14) approx 2 weeks
Ninja Gaiden 500,450 (released march 2) approx 7 months
Ninja Gaiden deserved more sales than this. But I definately see how Fable could cater to a wider audience (i.e. easiest game ever).