I didn't mind that the rat king had gone feral, he was a beast on the battlefield anyway.
That fact, that we apparently still invited him to strategy meetings, and tried to get his input on important discussions, that he usually just ended with "I'M GOING TO KILL HER" and then we actually went along with him, that was what rubbed me the wrong way.
I mean, on the other hand, relying on Byleth for decisions doesn't seem to be the most sound tactic either.
When they gave me a choice on where to attack next, I literally stared at the options and asked myself "shit, I wasn't paying attention, where are these places exactly??".