It's certainly not the worst.
Let's start with the plot.
OK. It started off alright, but they could have ended it at the title as a short. The rest follows a classic slasher.
Many of the killings seemed pointless.
All of the characters were stupid except the antagonists.
Most of the dialogue consists of "AHHHH!", "NO! Please STOP!", "Why are you doing this?". If you're looking for proper character development, this movie does not have any.
The gore was OK. I've seen worse.