The way it was running, and yes I understand that it's a part of the SP content, is that it seemed VERY scripted in regards to where the sniper bullets hit and where the player was. Like it wouldn't have mattered if the player had been crawling prone, moving crouched, walking, running, dancing like John Travolta.... you get the idea.
Sorry, yeah it does look amazing and I REALLY REALLY WANT IT, but that whole "cuba level" video from black ops kind of makes me skeptical of things like this now.