Word of mouth is absolutely TOXIC on this film. Virtually everyone's panning it on Twitter.
I was wondering why we didn't get this film, but that was due to the dumb booking department (they didn't book the first Paranormal Activity film when it went wide). But after hearing several stories of people booing the ending and demanding refunds, perhaps it was good we didn't get it this week.
But Paramount has already broke even on this movie, just with midnight showing earnings alone (plus a small but effective P&A budget). Even if the movie drops like a rock in its second weekend, they'll probably turn this into the next micro-budget franchise.