1. On a scale of 1-10, I'd say my satisfaction is an 8. It's how Jo ended it, I'm satisfied with it.
2. Not really, not even what happened in that 19 years or the adventures of their children. I'll just wait for the encyclopedia)
3. Battles between good and evil have always been with casualties. It would have been odd if there weren't tragic deaths in the end. It's not a fairytale story even with the Epilogue bit.
4. No. She's always been firm from the beginning that she'd only write 7 books corresponding to the 7 years at Hogwarts. I think that's really part of the HP enchantment. It's one of the things that gave the series character.
5. Yes, 101%. She may not be the most original author, but she nevertheless presented old ideas in a refreshingly entertaining style. Her books cut boundaries -- age, political, economic, cultural even intellectual and religious boundaries. No other author has done that yet. Even without the media hype which certainly helped in the success, her books could stand alone.
6. Yes, of course. Same reasons as no. 5. The media & publishing hype might fool some, but certainly not all the readers. If the books are just a bunch of rubbish, no amount of hype and extravaganza would make it succeed.
7. Every Fred and George moment is unforgettable for me. But the one with the most impact would be that last page of the Battle of Hogwarts. With Percy (or Ron) shouting "No, no, no! No, Fred, No!".
8. Fred and George Weasley hands down. Dumbledore comes second. The twins because they're totally mental, they can turn even the most dangerous and serious moments hilarious. Dumbledore because of his wisdom, wit, poise even in the face of outright disrespect. I totally love those scenes when he always corrects Harry and say, "Professor Snape, Harry."
9. Before Book 7, it has been Dolores Jane Umbrdige. But after Book 7, she's been dethroned by Pansy Parkinson just with that line of "But he's here! Someone grab him!" The prat!
10. Excluding DH because as an ending it tied up the series, Prisoner of Azkaban is my favorite. It's the only book where there was really no danger for Harry and the wizarding world because Sirius turned out to be innocent. Lord Voldemort was nowhere in sight. It's the only book where we felt good in the end because along with Harry, we discovered Sirius.
(Lord Voldemort gave you a star and I'm his most loyal follower, so I'll give you one, too!)