I just assume it was just to save time and money. I mean imagine the cos of hiring voice actors/ actress (this included ALL the available languages needed for the game) and the time to record them.
Either way, I don't really care since I'm not the type who throw a hissy fit if the character voices doesn't sound right.
Either way, I don't really care since I'm not the type who throw a hissy fit if the character voices doesn't sound right.