the reaction of the fanbase reveals just how shallow, limited, and divorced-from-reality the typical otaku ideal of a “pretty girl" really is.
If the "pretty girl" in that line refers just to the looks like I think, then that's fundamentally wrong. The real actresses that acted the scenes before they were rotoscoped are nice in looks to boot, I'd say (all the episodes are available to be watched with the real actors if you want, but the static shots get incredibly out of place with live action, so I don't suggest it). They just fucked it up with the improper rotoscope execution, really.
There's a difference between minimal, realistic, and plain bad chades. For instance, Yuasa's chades works really well in his works, even the borderline ugly chades in Kemonozume, because it is made to work out.
In the Aku no Hana anime, though, I'd just call it shoddy execution.
Rotoscope by itself is good: just watch the opening of the Cowboy Bebop movie. In Aku no Hana it's just lacking in quality, imho.
Also moe per se is widely considered cancer by anybody who's actually openmindedly watched their fair share of animation (both western and eastern). It's fine if it's limited as a fan-pandering device in a bigger picture, but when it becomes the point per se, it's just shallow and pointless.
I mean, the first big moe icon I can think of is Clarisse from Castle of Cagliostro, and I'm positive that's widely recognized as a top grade movie worldwide, despite the tropes it employed (a moe damsel in distress... actually now that I think about it, I'm not sure how well the movie fares under a feminist point of view?).
But then we have stuff like most of the KyoAni production of the latest years and it's just sad. That is a serious problem with anime nowadays (and if they get away with Free we are truly fucked up, because it means that moe works out and prints money both with male and female audiences and you just need to swap the sex of your characters, which means we'll be stuck with it for a long time still).
I like how Aku no Hana pokes fun on the average moetard anime viewer and related tropes, and thematically it's spot on. I also think rotoscope was a fitting choice for the show. I still think it was poorly executed, though, and that's the big gripe I have with it.
They overly simplified the linearts and coloring, so it's just bad. A hyperrealistic usage of rotoscope instead would have REALLY been better, since it would have added to the creepy feel of the show. It would have single handedly raised the show's value. Unfortunately it looks like they needed to cut on budget so they went with what they did; and I'd say it didn't work out as it should have.