I'll be honest with you.
Apart from Neku cutscene voice acting, the English vocals for most characters are much better (in that they're less annoying/more fitting) than the Japanese. Well, Shiki sounds like a chipmunk, Joshua's voice doesn't fit his cocky snobbish attitude at all, and Sho's just not the same. Hanekoma sounds like he was hit over the head with a heavy object...yech, they just don't sound good at all to me ;(
Still, I have no objections if you want to rip them and replace the English OEWY voices with the Japanese ones, but at the moment I'm pretty much against including them in the skin.