There does seem to be a problem with the sound mix.
The 5.1 Mix is totally pointless, the only channels which are used are the front left and right and the subwoofer - not a peep comes out of the centre or rear speakers.
The 2.0 Mix isn't perfect either, it probably sounds ok in stereo, but when my DD Processor processes it and upmixes it to a Prologic (I and II) sound, it only comes out of the centre and subwoofer.
Shame really