3. Next Generation Graphics
People tend to associate the Japanese with an ever-increasing quality in technology, so it's a shock to notice that of Famitsu's list of the top selling games of 2009, only a handful, maybe 5-10 of the top 50 are PS3 games. The rest are handheld and Wii games, which, let's be honest, aren't known for their graphics. Apparently vague attempts at realism aren't popular in Japanese games, they're only popular in Japanese robots.
2. Grand Theft Auto
Yet again, one of the biggest fads in American pop culture barely makes a dent in Japanese gaming sales. This probably goes back to the idea of "dishonorable violence," but what's more honorable than violence in the name of the American Dream? Then again, the Japanese probably aren't that familiar with the American Dream.
Being that it's probably the most popular thing in South Korea, I find it surprising that Starcraft II hasn't even gotten a release in Japan. I think the reason for that is that I tend to lump all the Asian countries together, so it's really my fault more than anything. Again, it goes back to the fact that the Japanese don't play many games on PC's. If only we could find a way to port Starcraft to DDR machines