The highest grossing movie opening of all time was "The Dark Knight," which raked in just shy of 160 million bucks in its first weekend. Emphasis on weekend. "Call of Duty: Modern Warfare 2" went on sale this past Tuesday and, over the course of that day, made a whopping $310 million from sales in the US and UK.
Activision is approximating the total number of copies sold that day at around 4.7 million, which is a record for not only the video game industry, but also for any form of media ever. The previous best-selling video game over the course of a single day was "GTA 4," but its number was more than a million shy of "Modern Warfare 2."
So, in short, people like this game. Check out our series of interviews with the developers at Infinity Ward up top.