8.6 is very very high...
This says that it's better than The Prestige (2006) and The Departed (2006) which is not true imo. Either those movies are underrated or this one overrated. Idk what were the voter thinking while judging this movie. I guess the main difference is, i saw this movie in 2015 and have already watched other thriller/mystery movies while those who gave it a 10 may have watched this movie as the first movie of their lives.
I almost forgot mentioning SAW (2004), the mother of twists.