My mistake. A lot of websites were listing all the Sony games under the Japanese launch line up. Still there's more than just Uncharted that launched in Japan. F1, Uncharted, Little Deviants, Michael Jackson, Dungeon Hunter Alliance, and Asphalt are the Japanese launch titles. Out of 18 titles, that's still one third.

Regardless. It doesn't help that Sony released the Vita the month that the three biggest titles hit the 3DS with a weak Japanese launch.

Ninja Gaiden
This wasn't a launch title.