It worked really well in Mass Effect which is a great role playing game.
Yeah, and I think most people agree that ME's dialogue system was significantly better than DA's dialogue, simply because the one-sided conversations are awkward. It's not like ME had no choice in what you say, an in fact the things you say can actually have a big impact on the game.
Anyway, I just think the best options would be full voice acting or a return to full-text dialogue which has a lot of benefits (esp. RP benefits). The half-way thing was just always awkward, and made me miss Morrowind's dialogue.
I guess the effort to implement a real time dialogue system just seems pretty silly with no player voice acting imo.