I've seen bits and pieces of the Japanese Version... eh, I still prefer the dub and its dub cast. xD
Honestly, I actually don't like Kaiba's Japanese Voice. The acting's fine, but the voice sounds a bit too old and rough for a mid-teenager IMO. xD
Aside from Yugi's seiyu, Hiroki Takahashi (Joey), Rica Matsumoto (Bakura) and Junko Takeuchi (Mokuba),
everyone else sounds like they're underacting/reading off of a script, but that's just me. xD