Horrifyingly Bad While the plot itself could have been interesting, I can't decide whether the writing or the acting is worse. Regardless, both are shamefully, appallingly bad.
The Setting: a remarkably upscale, ethnically-diverse, nearly-rural Ohio town, which neighbors the mysterious Ammon County, an isolated, rural farming community owned by a band of unfriendly yet inexplicably politically-connected, corn-growing, hog-raising Satanists.
The Characters: our protagonists are members of a local bourgeois family, comprised of an estate-developing general contractor father (who does all his own labor) and a well-meaning but unstable psychiatrist-mother with a past of her own. Together, they have three daughters: a closeted bisexual beauty queen; an angsty, artistic, unpleasant photographer with "middle-child syndrome"; and an obnoxiously-talented, mostly-neglected, obviously-adopted sister with a peanut allergy. Because...why not?
The Plot: while on shift at the local hospital, mom is assigned to a recently-arrived teenage "Jane Doe", a runaway from the Satanic cult, sporting a freshly carved inverted pentagram on her back and scars around each wrist. Over the next few episodes, we learn more about "Mae", the foil of the story. Mae's trauma quickly triggers Mom's unconscious Savior complex, and, due to a convenient lack of foster placements, brings Mae home with her, upsetting the already-stressed family. Hilarity ensues.
I'm convinced this script was written by AI: every character is an utter cliché, and the casting director made sure to cover all the politically-correct bases. Every kid at the girls' high school is the most basic of stereotypes, and almost all of them are some shade of mocha, from the ultra-cool lesbian; the brooding flaming BFF; to the high-achieving, Ivy League-bound, "Feminism-Rocks" t-shirt-wearing love-interest, whose ultimate goal is to work for the ACLU. The only other white kid besides the main protagonists is the beauty queen's boyfriend, a clueless dumb jock bound for the local state college. Remember, we're not in Los Angeles, New York, Chicago, or even Minneapolis. No: we're in the middle of semi-rural Ohio. But...okay.
While the cult's backstory is quickly explained (don't blink, you might miss it), it's never fleshed out, nor is any of the characters. They are all-to the person-shallow and unlikeable, impossible to relate to, and none of the relationships are never explained in any meaningful way. Impossibly, they even managed to make the SATANIC CULT boring and lame.
Other reviewers have done a good job covering the myriad of other problems with this series, and I don't have much else to add.
In a nutshell: this series has all the depth of a day-old puddle, and it's a perfect illustration as to why Netflix is tanking.
If I had to give it a grade, I'd give it a solid D-.