To be entirely honest I think the telegraphing is because the industry does not have the guts to do real horror games anymore. It's similar, but not identical, to how they show you the monsters coming in "Alan Wake". Fear is a negative emotion and freaking out gamers is liable to be an even worse freakout to casual observers, and the gaming industry is really afraid of the criticism with everything else going on. Hence the arguements for cheeseball "psychological horror" and the like.
I think the death of horror gaming really came with "Silent Hill 2" as praised as that game was, people tend to forget that it was one of the first PS-2 games, and the demos for it caused an outcry because of the flayed children monsters that were a stable of the original game's rogues gallery. They were TOO disturbing, and the developers of Silent Hill 2 removed them instead of fighting properly under the grounds of it being an "M" rated game. After that the censorship sharks smelled blood and pretty much swarmed the game industry, especially when it came to horror games, and nowadays all we get are telegraphed action games, or crappy "psychological horror" games that really try and rip off Steven King's later work which is amusing when you consider how generally criticized it is.
I actually paid money and downloaded "Amnesia" for example, largely because of the huge number of reviews I was getting. An unplanned purchuse that sort of hurt because despite all the games I buy $20.00 can be a lot of money to me being disabled. I *DO* give it points for some neat ideas and an interesting atmosphere, but really I can't say there is any kind of satisfying payoff. What's more in playing that game I feel like my character is borderline retarded in addition to having amnesia. I wouldn't be surprised if there is one day a director's cut that shows that it really wasn't a past century, and the truth is that a short bus crashed outside, and a delusional retard stumbled away with a head injury and started walking around some poor guy's house lighting fires to deal with his scotophobia while periodically collapsing and screaming delusionally about unbeatable monsters.
To be honest it goes back a ways, but I think the last horror game that I thought was actually creepy was probably "Rule Of Rose" for the PS-2. That was actually pretty differant, but at the same time, it involving children (which is what made it creepy) caused a degree of outcry and as a result it means that we're unlikely to see anyone do anything similar again, or at least not with a US release. The bottom line is that genuinely creepy/scary = complaints = game industry backing down and correcting itself to make sure they don't do anything similarly disturbing again.
I think the violin music and showing the approaching monsters in Alan Wake and such isn't done for psychological purposes, as much as to defang any chance that anyone could be scared and reduce potential criticism.