i enjoy horror movies that are more real, like the strangers.
Nightmare on Elm Street and Hellraiser, the grudge, the ring etc. i find them lame because they are just stupid. But when you get a movie that could very well happen and was inspired by true events the movie feels creepier and fun.
As for predictable, i can't think of one horror movie that i couldnt predict most of the movie, and i've seen a lot of horror films.
I found the acting fine, and a halloween rip off? why? because they wear white masks over their faces, so? other than a very roughly similar mask nothing in this film resembles halloween, the killers were very much human, their were 3 killers, the main characters died, most of the film was banging on doors etc.
if you going to resemble it to a film, use 'vacancy' instead.