The topic is just what it sounds like: what is the least scariest horror movie you have ever seen and why? But let's try to stay out of the ridiculously bad (for example Troll 2, Birdemic) and focus more on large-ish movies that had absolutely no effect on you and made you stare at your watch.
A remake of a slasher series that wasn't really revolutionary when it came out, Prom Night (2008) is one of the poorest efforts to make a horror movie I have ever seen. Why?
1. It's completely goreless with all killings going offscreen Alien vs. Predator style (ooOOoo use your imagination ooOOoo).
2. The killer looks like your average Joe, which COULD be scary in the "he could be anyone" way, but he just comes off as completely non-threatening.
3. The film doesn't even have jump scares. Seriously, there is absolutely no sense of tension or surprise. Every time he kills someone, he spends 6 minutes fighting them, the camera zoomed in on his face to make sure he REALLY doesn't look scary at all, and then it cuts to another scream-and-wide-shot cop-out killing from #1.
Overall, it's what would happen if a timid 60-year-old man made a movie based on what he considered scary in his day rather than any attempt at actual horror.

A remake of a slasher series that wasn't really revolutionary when it came out, Prom Night (2008) is one of the poorest efforts to make a horror movie I have ever seen. Why?
1. It's completely goreless with all killings going offscreen Alien vs. Predator style (ooOOoo use your imagination ooOOoo).
2. The killer looks like your average Joe, which COULD be scary in the "he could be anyone" way, but he just comes off as completely non-threatening.
3. The film doesn't even have jump scares. Seriously, there is absolutely no sense of tension or surprise. Every time he kills someone, he spends 6 minutes fighting them, the camera zoomed in on his face to make sure he REALLY doesn't look scary at all, and then it cuts to another scream-and-wide-shot cop-out killing from #1.
Overall, it's what would happen if a timid 60-year-old man made a movie based on what he considered scary in his day rather than any attempt at actual horror.