Things that would have made Amnesia scarier

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Making new enemies smart enough to check the closets and such would be excellent!

...and then? I mean, what happens after it checks the closet? With the monster right in front of him, the player has nowhere to run, so he just gets insta-killed. Wouldn't this make the whole mechanic of hiding somewhere pretty pointless?

You could maybe make it so that the monster would randomly check one of several hiding spots in a room, but never the one the player is in... players would eventually see through that trick of course, but hey, thats always the case with AI isn't it?

I guess it could also maybe make for an effective scare, if it was used exactly once. Like, you've been hiding successfully from stupid monsters throughout the game and suddenly you happen upon a smarter one that you just can't escape from. Even if you hide in a closet, it will eventually find you and knock you out. Except that, unbeknownst to you, that's actually a planned part of the story and you wake up in a cell or whatever instead of respawning... with your faith in closets forever destroyed even though it will never happen again