I think people who played this game will agree that this is the best horror game ever made, It's better than Amnesia "The Dark Descent", Dead Space 1-3 and Silent Hill Series and way way better than R.E. Games...
...Considering Resident Evil 4 is the highest-rated game in the genre and one of the best games ever made I have little faith in the opinion of the OP. Although I've not played Outlast, and I don't know the metacritic score, the user ratings here are only 8.4. I'd guess it's much shorter than some games, like RE4, too. Only the first Silent Hill game was really good a seriously scary (they went all surreal and had crap puzzles later). Also, Project Zero 1 & 2 were good survival-horror games too.
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Outlast - 7.8/10 ign review score. Not a good score, even for the genre. Seems like a rip-off of Condemned too, only with a worse rating. You'd be better off going for RE4 HD, if you've not played it (although it's not that scary, just a great game - probably top 10 of all time). Dead Space 2, if you want a good game with scares.
Outlast is far scarier than any of the games you listed. It truly is a gem. If you still haven't played it you really should. Especially Whistleblower.
I was never truly scared by a game until Slender. And then Outlast came along, and I was even more scared. I was literally screaming at the computer, sat in the dark with headphones. Without realising, god rest our now ex-friendship, my housemates came in and were watching and laughing at me for five minutes. It was only when I felt I was being watched I turned and saw them.