How did this get an 8.5 I seriously don't understand

Rating: 4/10 (1 May 2016)

Let me put this straight: This movie is simply boring. It is different from other movies and it does have a plot twist but it failed to hold my attention so when the plot twist was revealed, I didn't even bother to care anymore. The storyline is stupid, I don't understand why many people here say it's clever and entertaining, to me it's so so so boring, repetitive and pretentious to the point that I kept wondering: "what is the point of all this when we all know the protagonist's final action already?" Oh and talking about the protagonist. He is an incredibly unbelievable character, at the beginning I thought he was supposed to be funny but after that when I realized he was pretty serious about his "condition" and all the vengeance thing I lost interest and couldn't care less. The movie is only 1 and a half hour long yet the number of times I yawned while watching it was countless.