I agree with you, Unforgettable Lemon, in that "Goblet" is also my favorite book of the series. "Azkaban" was well done - the best of the first three, but "Goblet" seemed to have it all. It had the mystery, it had the tournament, it had death and it even had a bit of open-endedness to it. Given how involved the book is, I fear the movie will be sadly performed. One thing I enjoyed about the Chris Columbus films is that he did a great job of sticking close to the books. No, he didn't capture everything, but he captured not only the essence of the films, but all the little details as well. In contrast, there were quite a few details - some very crucial ones - left out in the third film. If I hadn't already read the book, I might have been lost!! So I'm fearing the worst for this fourth movie...
But getting back to this sixth book... I'm sure I'll reread it. It's a far easier read than "Pheonix". Book 5 was well done, but Rowling also spent oceans of time on Harry's feelings. Pages upon pages were about Harry thinking, reflecting, being angry, etc. In a screenplay, these can be easily chopped down - in fact, one look can state what took Rowling pages to write! So it'll be interesting to see how Book 5 translates to the big screen.
But I also felt all that detail about Harry's inner thoughts was a bit too much - a weakness of the fifth book. Fortunately, that was cut back tremendously in this new book. However, as soon as a "death of a character" was mentioned, I immediately knew who it was, and was sadly proven correct. It only made logical sense (for so many reasons). And while Rowling tried to play up the intrigue aspect tremendously (with Draco), it just didn't work nearly as well as anything she had done in the prior books.
As I wrote, the best part of Book 6 is the possibilities. Perhaps that character *had* to die and in exactly that manner. Maybe that was what the whole "trust" issue was about. Again, I can't go into detail for fear of spoiling it for those still reading, but those who have read will know what I mean. So I think the possibilities in Book 7 are there for a climactic and thrilling end. Still, I feel Book 6 could have been and should have been so much more than what it was. It felt more like a transition - filler, if you will - until the big ending.