It might be some different point of view, but I seek that the biggest reason why Shaft become degrades is because they are horrible shit on making time schedule. They procrastinate every single time, they make several notice that they will make it in certain date or time but never follow the promise. This makes me really mad. Plus they art type seems very extreme in certain cases where it does not match with certain genre. EX) Niesoki seems to do not match with the art style with Shaft due to uniqueness where it requires sweet love art.

I would like to say that Shaft is aiming for Manic level for Otaku and anime lovers. Remember the time when Tyoto Animation was taking all the shit and popularity. They were dominating the anime market with Key who made Clanad and Kanon....

Shaft s the studio where is focusing on Ecchi, harem, and some fan services.
Because, most of the people do want to buy Blue-ray DVD on those one .. sadly.

This is the reason why they pick up from Light Novel monogatari series because they have lots of scenes where it synchronize with the anime.

Well at the very least they made Kizumonogatari series which I think it was good with quality and followed the story line