The amusing thing to me about the whole play through thing, is that the YouTube guys play through is actually closer to 6 hours, not 5 hours, and as mentioned before, that is ignoring the viewables and collectibles, and playing on an easy difficulty. But for some reason that is being misconstrued to form a narrative that the game is only 5 hours long, even though that doesn't even line up with the videos, or with the other confirmed GAFer play times we have, which are closer to 10-14 hours (these ones including much more exposition and collectibles, and harder difficulties).
Funnier still is that all the positive impressions of the game from those who have or are playing it, are getting drowned out in all this.