I agree with you. No verbal interaction, no sighs or moans of passion. It seems to me that they were doing what they did simply for the money. Certainly not for pleasure.
I cannot believe that I have watched this video again! I had forgotten about my first viewing - it is imminently forgettable - the girls act as if they would rather be elsewhere! The only saving feature is that the girls are pretty and are worth a fucking (especially the one with glasses).