It's still qute dark and creepy ingame (especially in the forest).
I've analyzed more than 50 playthroughs and more than 30 review. I can surely say such a dense fog strongly disorient players and also zombies pops up so close to the players, that they can't avoid the damage.
100_o/o_f@ke
Kirill joined
Author and developer of Back to school campaign for Left 4 Dead