Before I delve into the bowels of this movie's storyline; I have to state for the record that before watching it, I was relaxed. After watching Hereditary, I was so uptight, that I squeaked when I moved. Once in a while, a movie comes along which can mess with your head that much that by the time you have watched it on several occasions, you still can't decide whether or not you love it or hate it; Hereditary for me is one of those movies.
In saying that; after much deliberation, I believe that I neither hate it or love it but respect it immensely for its extraordinary atmosphere of tension, edginess and graphic detail. And now for the movie's narrative. Hereditary gives us the story of the Graham Family's slow descent into hell after the death of Annie Graham's mother Ellen. From this point onwards, the dysfunctional family setup between Annie, Steve, Peter and Charlie becomes frightenly obvious as each family member seem to be uncomfortable whilst in the presence of each other and therefore spend most of their time in separate rooms. What starts out as a tense psychologically broken family story, ends with a very nasty vicious horror climax. Toni Collette is absolutely disturbing in it; her portrayal of Annie kept me on edge throughout the entire film with only two other movie moments that I can remember whereby you feel as if something is going to happen more and more as the tension builds in movies like The Hurt Locker while they are trying to disarm a bomb or in Foxcatcher when Steve Carell's performance as John Du Pont has you at bursting point with anxiety. Hereditary is a whole different monster with the pressure cooker starting to boil at the beginning and going supernova at the end. Gabriel Byrne, Milly Shapiro, Alex Wolff and Ann Dowd are all brilliant in their parts, proving that casting really did get it right this time. The soundtrack to the film is so sinister and unsettling, that it would over time disturb your mind and therefore wouldn't be recommended for relaxation. The director, Ari Aster has done quite a job with this movie, his vision both perverse and visually gothic; in my opinion, the first of many great movies in what could be a very promising career providing he doesn't sell out by making countless sequels that seem to get worse as each one passes by.
In the end, what everyone wants to know is should you watch it and will you like it. My answer is yes you should watch it and as for the liking it part, that will be entirely up to you. If you're expecting a straight forward Horror film which falls neatly into the Horror Genre, this is not the movie for you. On the other hand, if you avoid the trailers, and keep an open mind which will allow you to watch this movie and rate it by its own merit, chances are, you'll enjoy it.