Only 3 anime entries have ever made it to the 10/10 spot. These entries are my idea of perfection. Something that I can watch for days on end and never get tired of it.
The 9/10s are Herculean, meaning they’re packed such a heavy punch, while being unique and irreplaceable, that they broke through the four-star barrier. Some of the four-star series, despite being unparalleled, have flaws. I personally did not like the finale of Neon Genesis Evangelion and the unanswered questions it left in its wake, as opposed to something like Texhnolyze, that is comparatively unsoiled.
The 8/10 ranking is for something that is not only emotionally compelling, but a story that is irreplaceable. Something that I believe cannot be replicated, like Omoide Poro Poro or Neon Genesis Evangelion.
My SO, @SakihataLily, is kind of baffled at this, but I refuse to give anything a 7—10 ranking if it doesn’t rouse some kind of emotional reaction out of me. A 7/10 is where an emotional connection is made and I’m very invested in the characters and atmosphere of the story.
The 6-rank is reserved for series that I think are really neat, but are not emotionally invested in. The dividing metric between by 5/10 and 6/10 rankings is that a 6/10 is typically something that I am so enthusiastic about, that I would buy the Blu-Ray, DVD, or merchandise for said franchise. The Irresponsible Captain Tylor is a really well-rounded and iconic series, so I would want to buy it, but it doesn’t emotionally move me, therefore it doesn’t get a higher score.
The 5-rank means that I enjoyed and found merit in said series, but I wouldn’t buy a copy of it on DVD. For example, I rated One Punch Man and Kaiba a 5/10, both have their respective virtues as cohesive stories, but I am not enthusiastic enough about them to buy the Blu-Ray or merchandise.
The 4-ranking is typically something that I really want to like or do (in a few sporadic cases), but something went horribly wrong and it incapacitated me from being supportive of the show’s narrative. I typically find some sort of enjoyment out of a series with this rating.
A 3-ranking means that something in the story went terribly wrong or I just found outstanding grievances with the story or presentation. I typically do not enjoy watching (or reading) a series with this rating.
Rating something a 2-rank means that I was completely miserable while watching it, but there was something admirable or redeeming about the work in question. Whether it be the artistry or a certain interesting plot point that sticks out.
The lowest score, the dreaded 1-rank, means that I was miserable while watching the series or reading that particular book, and wasn’t able to find any redeeming qualities about it.