I can understand how you feel, but for me it literally made me like cry out in rage in Panda Express cause I was like "noooo I want to see whats next!" (no joke i finished it like 15minutes after class in Panda). I feel that the whole revelation that he has a CHOICE to do whatever and not even MAB can take that away from him was a really great conclusion. It shows that Harry will still be himself, but be in a greater position of power to act against whoever his enemies may be (preferably the Black Council).

the blackstaff and the winter knight tearing through the black council would be NICE.  what did you and grampa do today? well.......