What do you think of the game's length?

[Neurological]

Personally the lenght of a game depend on the game itself. Amnesia have the right lenght, not too long, not too short.

If you would make it longer it would drag over and over the same formula, and may become boring after a while. What it count in a game like Amnesia is variety.

Amnesia have a good variety of situations and puzzles, not too hard to pass which is a good thing because didn't break the immersion.

Nowdays the games that are really short with almost no variety are FPS, Amnesia is a genre on its own so maybe the critics had a hard time to get into the concept.

Another thing overlooked is modding, sure you can create almost more of the same with the tools, but isn't a bad thing there are already good mods, the community just need time to grow and make more different stuff.