Thanks for the recommendation, I’m really enjoying it so far!Your scenario reminded me of a really good "what if" story where Harry is sorted into Slytherin. Read it years ago and was very much surprised by how well balanced it was. It showcases a tad more of a personality to Harry and various characters, delves into a mature and realistic brand of storytelling, and portrays how Death Eaters are realistically radicalized.
It isn't, "Lel, stupid mudbloods." It's actually more than that. Much more. It shows how Slytherin students are driven into it by family, peer pressure, and ostracization. In addition, the "good guys" are shown to be ineffective and uncompromising, especially when they are shown to be bigoted in their own way regarding Slytherin and dark magic (Ron is portrayed; from an outsider's perspective, as being prejudiced against them), inadvertently contributing to the problem. Even Sirius isn't exempted, as by reading between the lines, the author doesn't shy away from having him look down on Harry being a Slytherin; his own House.
What I find ironic about this is that the Weasleys themselves aren't exactly free from the same brand of being prejudiced, for ironically being a pure blood family.
This has less to do with the fanfic, and more with having gone back and really look into Ron's overall behavior and mindset. He was actually terribly prejudiced against Slytherin and dark wizarding families, proclaiming that they were no good, dastardly snakes who couldn't be trusted.
I guarantee you, if the books was more adult oriented and showcased society more realistically, it would have been less "good vs evil" and more of a "people being flawed" narrative. Sure, there are some genuinely evil bastards who didn't take much to become evil bastards, but those who fashion themselves as being the opposite are easily hypocrites who look down on those they consider "evil".
Why does that feel so terribly familiar?