Had forgotten about the Left 4 Deads, though as you say it's more small comments such as "RELOADING!" that get bandied about, rather than the scripted action pieces that were in the video.
Looking at the video I'm thinking that this'll be the intro sequence which is why it is so scripted. I should imagine the game will start properly once your character wakes up again after passing out (?) at the end of the video.
One final note: Anyone else think that the character was a Big Daddy variant at first? What with the heavy thumping footsteps that turned out to be, what can only possibly be described as, an automa-horse...
Looking at the video I'm thinking that this'll be the intro sequence which is why it is so scripted. I should imagine the game will start properly once your character wakes up again after passing out (?) at the end of the video.
One final note: Anyone else think that the character was a Big Daddy variant at first? What with the heavy thumping footsteps that turned out to be, what can only possibly be described as, an automa-horse...