That's a rather odd thing to say, and it could be said about any area at certain times, couldn't it?
Here's a chart of the different machines market shares in each area (I forgot why I originally put it in here...
)
Wii:
Japan: 16.2%
Americas: 46.4%
Others: 37.4%
Ps3:
Japan: 14.2%
Americas: 38.4%
Others: 47.4%
X360:
Japan: 0.3%
Americas: 57.1%
Others: 39.4%
DS:
Japan: 25.8%
Americas: 34%
Others: 40.1%
PsP:
Japan: 25.7%
Americas: 35.3%
Others: 39%
So a few things:
1. Your belief that the PsP is more Japan centered than the DS are incorrect. They may be slightly more so at the moment, but that isn't very relevant.
2. The Ps3's relatively set largest market (compared to the others) is definitely Others, not Japan.
3. If you go by population, the percentage split "should" be something ala
Japan: 12.5% (125M population)
Americas: 35%(350M population)
Others: 50% (~ 500M active (as in, likely to buy a machine) population)
It's rather obvious which console fits under this describtion the best. So, in that sense, the Ps3 is the most worldwide console - it sells equally much (pr habitant) in each area. The DS is (roughly) tied with the X360 for the least worldwide appealing machine (relatively to the its appeal in other areas).
(I'm sorry for using so much space and not saying more, but I forgot my main point - sorry!)