I also consider Origins to be the scariest. Not quite sure they though. I think it has something to do with the fact that the game seems to be set up in a way that you need to run from the monsters more than in any of the other games. Less item pickups, more dangerous monsters and a winder open spaces. I think this relates to the fact that Travis seems to be running from his problems rather than facing them. This seems to be supported by the fact, among many other facts, that he is a trucker. Anyway, I have always found it more freighting to be chased by something than to face it head on.