The human darkness and the inhuman ability to resist even in deep struggling: this is Handmaid's Tale. And it's definitely not for the faint-hearted. It pushes our minds into an universe of evil and cruelty: if the women's condition is one of the (few) things that western society concords about, here we see this fall apart completely in front of us. All directors (especially Morano) plays with our perspective: the power of details is incredible. Facial expressions, sounds, scenery, all lead to reveal the world as it is: a place not fit for humans like this. The Janine' suicide attempt scene in the ninth episode is the most powerful example of this: one can really hope that the suicide take place, because, for a fragile mind like her, death can be the only pain-relief possible, a vision that Offred refuses during the entire season. Offred is just a baby-making slave, but the character evolves to became a powerful leader that can literally save the world, because the pain she suffered has created a monster in her, maybe even more powerful than her masters. By the end, the story turns into a carousel of resistance images.
The level of oppression really stands up near the one in Oldboy (Chan-wook Park, 2003), which is one of the most terrifying in cinema history.