I hated Half Blood Prince. Harry became a perfect angel and I can’t deal with the role reversal that occurred between Harry & Dumbledore. Even with the release of Hallows there are plot holes. But worse, and I did not write this in my Hallows post, but I have told a number of people that she lost at least a star or her two for her messy epilogue.
And by messy epilogue I mean, she neglected in writing her seven volume fantasy opus to finish. She created a marvelous world and a cast of interesting characters; and most importantly she created a media frenzy. Unfortunately, the media is obviously more important to her than the literature. 
And by messy epilogue I mean, she forgot that her duty as an author is to tell a story in her novel. Not write a novel, and then later give out the juicy details. Not write a novel, and specifically mention characters who have never existed in just the last five pages to elicit future questions that she can answer in interviews. And while people may have said I was overreacting I think we can now put that to rest and say that JK is pretty clearly a media-whore.
This weekend JK Rowling outed Dumbledore in a question and answer session. And there is even more back story than we knew, he fell in love with Grindelwald. But none of this is in the story. And while I am not against Dumbledore being in love with Grindelwald I don’t believe the books deal with such issues of sexuality and reading into them for that goes far beyond the text we have been given.
As Ross Douthat of The Atlantic Monthly said:
It seems like a case of J.K. Rowling trying to retroactively bestow a level of adult complexity on her characters that they don’t possess on the printed page. A writer confident in her powers wouldn’t feel the need to announce details like this after the fact.
It is all part of the same problem, the books are not complete, she wants more attention, she wants to continue giving interviews and keep fans excited. There are over 700 news articles today about Dumbledore’s sexuality. There are forthcoming plans (of hers) to write an encyclopedia of Harry-Potter-relevant-facts, but even that will never be a complete account of each new detail she comes up with.
And by messy epilogue, I mean this seals the fate of the books; if she keeps talking more of the story will exist from her mouth than from her pen. It is likely a failing of mine that I want the story to be in the book not told to me later by the Times, I want the literature to be a piece of artwork created by the author, not a device to support their growing ego.
Note: I don’t hate Dumbledore for being gay. Gay wizards are cool. I am all for gay wizard buttsex I just would prefer if the porn would have been in like chapter five, not just in the space between JK’s ears