I like the W.A.S. scale for rating anime. It stands for Weeb Ass Shit, and you rate each of those things on a 10 point scale.
So like, a series that requires extensive knowledge of japanese culture, or one that relies on the audience already being very familiar with the media tropes that it’s parodying, would have a high Weeb score while one that any 10-year old american would totally understand would have a low Weeb score.
The Ass column is for how much gratuitous nudity or attempts at titilation there is, with pure and innocent things like most ghibli films getting really low numbers, things like Bakemonogatari or Kill la Kill ending up in the middle of the scale, and borderline hentai at the top.
And finally, the Shit column covers things that are just fucking stupid, or poorly implemented. Low numbers indicate a series that is extremely well written and has a lot of good ideas, higher values come from plot holes, idiot plots, authors shoehorning in some incredibly nonsensical philosophy, etc.
Some people don’t mind the weeb nonsense at all, so they only have to look at the other two categories. Some people have very little tolerance for ass, even in a series that is otherwise of high quality. Some people decide based on a combined score, like they can tolerate more ass if the shit level is really low or vice versa but refuse to deal with both at the same time.