Kyosho: You expected otherwise? The only time I've ever heard a dub that didn't suck was Kingdom Hearts, and that doesn't even really count because most of the characters were Disney and should be speaking English anyway.
Anything with an anime look and feel should have Japanese voices, though, because there's never been a good anime dub in history (I don't care what anyone says, the Cowboy Bebop dub was atrocious, especially compared to the amazing Japanese cast).
Frankly, the prospect of having to put up with English voices is really killing my desire to buy both ToS and Baten Kaitos...if they'd leave the Japanese voices alone I'd most definetly buy them both, no brainer.