I can't really say that this wouldn't be a great idea. Obviously, we'd need a break of about a decade or two, and I don't think this could be reliably done with live action unless a lot of things about doing television change any time soon. But an animated series would be good, and it would do better than the films have done.
As for
Half-Blood Prince, what can I say? I did not like the book. I think the movie missed a lot of points of emotional resonance--it felt rather like it was hitting marks, but not making me care that it did. I had a sorta similar reaction to this as I did to the
Wolverine movie; I knew what was coming, and I couldn't get that excited about it. At least they managed to make the romance subplots somewhat bearable. I also credit Tom Felton with making me care, at all, about poor widdle Draco Malfoy. I don't think JK Rowling did half so well by him in the book, but she was hindered by not being able to show things he was doing from his own point of view. The movie, wisely, showed just how scary it was for him to be doing evil work. I did kind of pity him. Effective distraction, but still a distraction.