Is the IMDb rating ''8.2'' manipulated?

Rating: 4/10 (21 December 2017)

First of all this is one of the most disappointing movies of 2017, I really do not understand why this movie has an IMDb rating of 8.1, also because almost all comments are rating below 3. Second of all the story of this movie and the way they shown it is truly terrible.
Back to the IMDb rating 8.1, is this movie really comparable with movies like: Hacksaw Ridge, 12 years a slave, Into the Wild, Shutter Island, No Country for Old men??? Just NO WAY.