Madden NFL 09 is no joke. From July through September 2008, this game sold 2,994,000 copies just in the United States--making it the best selling game in the world for the third quarter--and it did so by a whopping margin.
Second place: Wii Fit with 2,089,000.
Third place: Star Wars: The Force Unleashed with 1,738,000.
Fourth place: Pokemon Platinum with 1,482,000.
Fifth place: Mario Kart Wii with 1,468,000.
Second quarter's winner was Grand Theft Auto 4 even though it was never released in Japan; just as Madden 09 is now in first place, despite that barely anyone has purchase it outside the U.S.
This is a significant indicator that the U.S. is an important market for the gaming industry.