There are certain horror icons that are so played out they aren't scary anymore. Pretty much any typical Halloween icon is not scary. Think about skeletons. They are definitely not scary. It would be silly if you saw a skeleton. There's no muscle mass there. Just give it a strong whiff of air and it's over. That brings us to the subject of this movie: demons. Demons aren't scary, right? Not since 'Hercules' by Disney. When I think of Demon I think of a cuddly little guys that I could step on if I wanted to. That's probably not the kind of demons that this movie is about though.
I love a bold title like 'Demons,' though. At least you know what you're getting. If you left this movie mad that you saw demons, that's on you.