Why do people keep bringing the Japan argument up. The difference between PS3 and 360 in the US is bigger than their difference in Japan. What makes this gap in Japan so important?

I still don't understand why a whole nation decides to ditch titles like Halo,Gears,Forza and XBLA.
To me that's kind of missing a generation right there.
Do they have a unified center of intelligence that's connected to all the gamers? It looks like they have a singular taste for everyone.

Misconception?  You're really saying that Americans don't buy a lot of shooters?  Uh.  Maybe you bolded the wrong thing?

If MS had sold half of what Sony sold in US it would've had a much bigger impact in the WORLD.

As far as I know, the trend shifted a couple years ago. PS3 games in general began outselling 360 games. Mind you I'm not talking about individual franchises compared to each other. Rather, total software sales. The 360 has sold more overall because Westerners account for a larger amount of game sales, especially the United States when compared to any other single nation. The 360 dominated the PS3 in sales in North America for a long time, and Europe to a lesser extent, for years after the new generation started. The 360 also had a one year head-start where it was the only next-gen platform selling any games. Like I said though, the trend has shifted. According to VGChartz, at the beginning of the year the PS3 was behind the 360 in global software sales by about 96 million. The most recent global sales chart shows the PS3 now behind by 87 million. In almost 8 months time, the PS3 closed the gap by 9 million in software sales. This year alone the PS3 is closing the gap by over 1 million every month on average. Obviously not enough to overtake the 360 before the new generation starts but it could very well represent a trend that will spill over into the new generation. For the last few years, the PlayStation brand has been more popular. Even before the next-gen headlines we have now.

Yea and game ratio is higher on the vita than 3ds, I guess the vita wins right? When something isn't apart of the main stream it's easier to gain a higher attachment rate. Also yes the year longer on market does affect the attechment of the console eg the total hours of ownership on the 360 is more than the ps3 despite the ps3 having more units sold. Again no of this matter becuase the the question in the op isn't even a fact.

Why would the 360 being behind in Japan harm their attach ratio?  Japan traditionally has lower attach ratios compared to the US, so that would only help the 360 there.  Also, none of those new releases in your quote were even out in Japan that week, so again, that deficiency in Japan is only helping in that comparison.

It depends on the game. Not all sell best on the Xbox.Fighters and some specific series tend to sell better on the PS3. Plus, plenty of owners who own both systems tend to side with the 360 for multiplat games since they usually perform better there (in most cases). Most of my multiplat games on there, but I did get Tomb Raider and Portal 2 on the PS3 since they're supposedly superior on that platform, however.

And if Sony had sold the same amount MS sold in the US it would have had an even bigger impact on the world.

I bolded what he/she wanted people to perceive. European numbers are comparable to US in terms of marketshare ratio.

The franchise that mostly sold in both markets is COD. Not only in US.