I thought the acting was good considering they were just a couple of novice actors, and I thought the movie was entertaining but not scary. After seeing the alternative ending, I felt that maybe they should have gone with that, leaving viewers suspenseful as to what happened to the boyfriend downstairs... and opening up the possibility of a sequel. My oldest has a strong attention to details and has a tendency to pick out flaws movies, which could very well be the reason I came to my opinion.
Anyway, this movie just came out on DVD yesterday.