I think it's a hard line to walk, making a biopic about a genuine real-world serial killer and his wife, having said serial killer take up a pretty massive chunk of that biopic's screentime, and still not have it look as if you're trying to paint said serial killer as sympathetic - when you're a main character, when it's your story, you are the protagonist, and when the protagonist is a monster, that's... Yeah, that's a hard line to walk. And I think it's walked here falteringly. There's some very powerful moments, and it is absolutely an intriguing experiment in cinema, but I don't think it made all the best choices. I mean it's not a twist that Ted Bundy did it, 'cause all the world already knows... Well I mean, he's Ted Bundy. He's literally famous for one single thing, and it's being a murderer.
I can still recommend Extremely Wicked, Shockingly Evil and Vile to reasonable adults. Not a strong recommendation, but one nonetheless.
Final rating:★★★ - I liked it. Would personally recommend you give it a go.