Adventure & RPG
It does a great job of portraying the mind of a terrified individual, but there is just one area in which it occasionally falls short. You aren't that terrified. Without the occasional monster encounter, all you're really doing is walking around and gathering journal pieces while working your way into the mansion's basement. Despite the insanity effects and the random weird occurrences, there's really nothing to get you too scared. The current version is more than likely missing pieces that you'll see in the final release, though. So, once again, you'll just have to wait and see.
On the audio side, there's much more to get scared about. The ambient noise in the mansion is perfectly geared to get you jumpy and looking around. You'll just be walking along the hallway with your lantern out and suddenly hear what sounds like distant footsteps. As they get closer, you quickly douse your lantern and find somewhere to hide while you look for the source. Sometimes it's your imagination, as the wood does creak and insects do skitter all over the place. Other times, you've just saved your character's life. It's an extremely immersive experience, and can easily get you carefully leaning around every corner. It just puts you on edge.
So, the end of the story is this. Amnesia: The Dark Descent is currently immersive, fun to play, and will hopefully replace the hole that Silent Hill left behind. It has its rough spots, but there's still some time before its September release to iron those out. If it continues along its current path, it should be a great fall purchase for those who like long nights in a dark room with a thunderstorm outside.