My honest review.

Rating: 7/10 (4 January 2019)

I don't know if anyone really reads my reviews so I include a 'disclaimer' of sorts at first. Really, I rate on a fair scale. 5 is average (as in was ok but nothing special), I very rarely give out 1's or 10's because very few movies are perfect or complete crap.
TLDR: Overall this is a really good movie that I'm surprised came from Netflix Studios and wasn't released in theaters. It's a slow moving suspenseful movie with amazing acting and a good plot, and the ending is kind of a let down, but also fits into the entire narrative of the movie. Almost rated this an 8, but point deducted for some problems with the pacing and the ending. 100% worth watching though!
So anyway, it seems like most of the reviews here are divided into three categories. Those that 1star said "Ending sucked" or "No Plot",those that give it 10 stars and call it a masterpiece without really explaining anything. or those like me, that give it a fair and unbiased review. So here we go. 7 stars because this is an above average movie that almost made me want to give it 8, but just missed.
Acting - Just amazing. Really don't need to say more than that.
Plot - The plot is rough at some points and the ending is kind of a "um what?" moment, but overall the acting makes the plot / script work in a way that at least makes it enjoyable.
Directing / Camera work / cinematography / music- Again, all are just amazing. It actually shocked me that this was a Netflix film and not released in theaters. Simply beautifuly shot and it's amazing what the director got out of the actors
Pacing (just including this since a lot of people complain about it). The movie is a slow burn for sure, the pacing IS a little scattered but overall, the flashbacks are well placed and in general, it's not great but it fits the theme of the movie.