Like someone else said already; you can't blame the actors for the way this movie turned out. If it says in the script to scream 90% of the time without pretty much any reason, you just do so. Apart from the script, what makes this movie one of the most terrible things I have seen so far, is the way it has been "stapled" together. The director has no clue about how to set an atmosphere, the editor has no clue about how to avoid being extremely annoying. Maybe one acceptable thing in this movie was the music,... but even that seemed to be a bit too random and misplaced.
This movie is so terribly slow in every aspect of the word, that it is extremely hard not to stop it without even waiting to see how it ends. I had to watch it with 4 pauses. Not because it was scary or overwhelming, but because it is simply an annoying and time wasting movie. Avoid it, please. Do yourself a favor and go rent an Uwe Boll movie, even those are better than this, and that says a lot.
I still give this movie 2 stars because I admire the actors for not burning the film before it was released.