To be scary to me, it must frighten, alarm, or terrify me. Or make me jump sometimes. This movie didnt do too much of that.
Rather this movie made me cringe at the gore, feel some of the intensity of the action, feel wonder at the puzzle that unwound, and follow the chase to the next seen. AKA more of a thriller. I would call it a gory thriller, with a bit of mystery added.
Now something more like Final Destination, where one might jump when suddenly something appears quickly out of no wear. Now when I watch Hostel, it was gory, but that became scary in that it seemed more real and intense. I cringed , but the thought of how real it seemed or that I could be in that place became scary.
Saw series, the puzzles sorta distracted from being too attached to the situation. But the mystery of the puzzles was cool in its own way.
I do like how he said he despised murderers, and rather tested the will of people, giving them a choice of how to get out. Though that was a bit twisted.