I don't know what you expect from HT? It's still the same cores, just depending on the type of load you can get some extra performance. The important thing to note here is the shift of the product stack and it's a nice improvement for the regular customers.
Are you using surround with center channel? Voices often go through center only. Check the wires from that channel.
Edit: that's probably why the voice is also missing in this game when it defaults to 5.1, it sends voice to center speaker, which is not in the setup?