I really wanted to like this movie, especially based on the reviews, but it just bored me to tears. I just stopped after half way through and read the synopsis to find out what happened. Glad I stopped... completely unoriginal and yawn-inducing.
It started strong. I like how you, as the viewer, were pulled into the film's world. I was hoping that the first death would be the only Argento-style moment. Unfortunately, the tone of the rest just made me feel like I was watching another of the many films I've watched in the past. I wasn't expecting jump scares...just something new or original (somewhat).
I'm usually really forgiving of movies. I don't have superior taste or have high standards. I just want to be entertained and to be told a story. But, I do want something a tad original and fresh. I just didn't feel anything about this was original or fresh. It's bad, in my opinion, when I'd just rather read the synopsis rather than finish.
I usually give movies that are "meh" or "aiight" a 5. If you're at a 4, it means you fell below that to "not the worst, but I don't want to watch again..."
I'm not saying skip it. Just know what you're getting into before you watch. See the other non-spoiler reviews to see if it's your cup. If it sounds too familiar, and you need something new, then just simply move along. There are a ton of movies (especially French movies) that have great stories....horror or otherwise.