ssj12, the reason Japan hates the Xbox is THERE ARE NO GAMES FOR IT THERE. It's that simple. There's no demand for a system that has no games (see, Gamecube worldwide sales).
Think about it, the X360, despite selling around 75,000 less systems during launch, has well overtaken the Xbox's sales at the same point in time, and will double the Xbox's LTD sales overall, if not more.
Why? More games. The Xbox had very, very few games sell in the 50k+ range outside of DOA and Halo. The X360 has had nearly a dozen, if not more, games hit that range. Only 2 are DOAs.
Japan just hates the X360 lineup, since it's void of RPGs, and other Japanese fare. This is why Blue Dragon has nearly sold 200k units, Eternal Sonata and Oblivion have sold 70k, and so on.