For a Western FPS with a subpar localization, Modern Warfare did extremely well in Japan. Compared to the rest of the Western world, it didn't.
But what about the Xbox 360? According to early sales figures, over 10,000 Xbox 360 consoles were sold the week that Call of Duty: Modern Warfare 2 launched in Japan. Those who follow the weekly hardware sales will know it's been forever and a day since Microsoft has sold 10,000 consoles in one week — heck, in two weeks, even.
The boast in sales is believed to have been caused by the bundled MW2 console. Call of Duty is on a roll in Japan, outselling even Namco Bandai's Wii RPG Tales of Graces in its first week.
Since these are early sales figures, do wait for the official numbers later this week.