I guess...
Ultimately, it is just cosmetic. It can certainly make the character feel like he is not your avatar at times however. For example, my idea of threatening is a far more subtle thing that what was shown in the trailer. I suppose to you can't please everyone though.
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Well, the thing is, you wouldn't exactly get that in a text based dialogue system either. You're still shackled with whatever the writer wrote for the character to say.