I think all of it is rotoscoped to be honest.
I've read a lot into this Flowers Of Evil episode and found out that the mangka accepted this kind of animation, now that I know this, I accept it, I have yet to watch it myself (Since Crunchyroll will be streaming it today).
I think saying "it's a total fail" was wrong of me but that's more of the response from the Japanese Otaku that are over-reacting because they thought the character designs would be more closer to the manga, thus, the sales will look weak.
I trust Hiroshi Nagahama and it will be interesting as the series progresses, i'm going to be watching it all, even if all of it will be rotoscoped.