asian material + english voiceovers = EPIC PHAILURE
To a certain extend it might be true but actually it does depend a lot on the voice actors and how they actually act out a character through their voice.
No offense to the english lunia, but it just sounds like they are faking rather than acting.
Basically some of the voice just sounds like text to speech.
Once again sorry if it offends them, but then again they don't really have many voice actors as a profession in US, they can't earn much money like in korea or japan.
For example eir's Ha,ha,ha sounds like a sarcastic har har har(this is what you would hear when you use most text to speech) if you get what i mean.
Dainn and sieg sounds ok thou in a weird way, they sound like voices from strategy games like starcraft and command and conquer.