I was actually attached and felt like nearly enough has been satisfyingly done on all the cast, except Yuuhi, yeah, but he's already great as he is IMO. Maybe I didn't have too much expectation. Though it's true that I give it 8/10 so surely there are something I don't like but I can't remember what they are now (except so-so art and average action).
Don´t get me wrong, the story is well-crafted but they concentrated on too many characters for the short length if you ask me. Iirc, every knight got a 2-chapter flashback and that´s it. The death of the characters (who died obviously) had no real impact on me and i never truly rooted for anybody else than Yuuhi. I think it is handled better in Sengoku Youko but even there, the development was too fast in the first part, have not read the second part yet though and i am not that motivated to do so considering the change of focus.