The thing that i don't understand is why the low rating ?? You're saying that it's based on a visual novel and that they removed many important things compared to the novel ? Well, who cares ! i didn't read the visual novel so i don't care ! If you didn't read the novel like me, just watch this anime, everything is great about it ! the story is really interesting and thrilling, it makes you want to binge watch it till the end, the characters are great, and the plot is really cool, same as its predecessor Chaos;head, and yes, Chaos;head wasn't really good because ofthe many flaws it had, but if you don't focus on the details and watch it for its global idea, it was actually really original, and then Chaos;child is like Chaos;head, but without those flaws.

So, i advice you to ignore these low ratings and go watch it if you like mystery and psychological shows, it's really worth it.