bardicverse on 13 September 2009
13 million? No way, no how. I'd bump Pauls numbers a bit - perhaps 500k to 1.5 mil, with a more precise number hovering around the 1 mil mark. Basically, you can probably transfer COD:WaW's numbers over to COD 4 and be pretty accurate, as that is the main market.
On a side note, I still play COD:WaW regularly on my Wii. In fact, its the only game I really play on it these days. I need new games. 
