My 8/10 rating is for the first two seasons (covering Jeffrey Dahmer and the Menendez Brothers respectively), but my rating for season 3 (covering the life and crimes of Ed Gein) would have to be more like 4/10 - the decline in quality is huge.
The first episode of season 3 is excellent, even if it rushes through numerous aspects of Gein's story (e.g. His brother Henry), but after that point it's like a drop off a massive cliff. Season 3's main problem is the total fabrication of entire characters and plotlines - such as the babysitter storyline, but the biggest one concerns Adeline, who absolutely did not exist. Her inclusion re-writes numerous events and even some of the foundational psychological pillars of Ed Gein himself (e.g. Abject isolation, a lack of female relationships beyond his overbearing mother, and of increasing sexual dysfunction).
The desecration of Bernice Worden's character - as in, who the real victim was - also somes as a shocking embellishment. Quite frankly, I wouldn't be surprised if some sort of legal action was to be taken by the family of Worden for such a scathing depiction of the last person to suffer at the hands of Ed Gein.
Enveloping the various famous films that have been inspired by Gein's story is a neat idea, but the execution is quite sloppy. There is more reliance on recreating scenes from the films (e.g. The Texas Chainsaw Massacre) than on understanding what inspired which film and why: in regards to the aforementioned 1974 Tobe Hooper film, the clear inspiration was the 'house of horrors' aspect of Gein's crimes (furniture made out of human remains etc) - and NOT a chainsaw, which has no connection to Gein's story at all. Meanwhile, the time spent looking into Anthony Perkins' experience making Psycho (1960) feels similarly disjointed. The revealing of Gein's crimes to the American public was more of a watershed moment in the post-war crumbling of the national psyche, prefiguring many years of socio-political turmoil and serial murder - but such a thought barely enters into the conversation put forth by Ian Brennan and Ryan Murphy.
I've no idea what on Earth the showmakers were thinking with this third season, moreso when you consider how well-made the previous two seasons were. With plenty of story to tell from the true history of Ed Gein there was no need to add in so much made-up rubbish.
