I think the way the module uses monsters is consistent with the way they're used in Ravenloft PnP, depending upon the DM's style. Our medium has limitations - mainly that we can't always be overseen by a DM who can set the mood and use proper timing and the like. We also have to grapple with the fact that, while PoTM is a gothic horror server, it has elements of action-adventure and high fantasy. You can't escape these influences. The server manages to reconcile these various elements into what I personally feel is a harmonious whole. That's what I've always loved most about it - there is that sense of impending dread, there's a general ambiance of gothic horror with dashes of action here or there.
NwN cannot re-create the sense of helplessness and pure, visceral horror you experience in a survival horror game like Amnesia. It's just not possible - anything you try to do will just be irritating for those seeking to play NwN. So, you have to find a balance.
There was one night where Zivon and a party where getting back to Vallaki from a run through the Werewolf caves - everyone was beaten and bloodied. Well - it just so happened that a horde of dozens of werewolves were waiting for us along the road. That was scary, and entirely the result of the spawn scripts. So, while I agree that frequency and consistency are horror-killers, there isn't always frequency and consistency. A lot of the ideas in this thread are good, but they all face the same problem - they'll quickly suffer from both frequency and consistency.
tl;dr: Not moderated, server has a good compromise between horror and action elements. For the real horror experiences, you need a DM. That's just the limitations of the engine, folks.