It had 2 JRPG exclusives - Blue Dragon and Lost Odyssey - from the Final Fantasy series creator Hironobu Sakaguchi.
I just do not remember any of those exclusive games selling very well in Japan. Like I stated before, the amount of Japanese games that are only on Sony and Nintendo system in Japan is on a whole level compared to the Xbox. I cannot see any one in Japan purchasing an Xbox for Japanese content. If anything they would get the system for content that is not represented on the Sony or Nintendo system and it would need to be a different experience. Another RPG where there are tons of Japanese RPGs on Sony and Nintendo system I doubt will cut it. I will take a look at the data to see how well these games actually sold in Japan. Even so its not like the 360 was a top seller or even competitive.