"'Yes, thank you, Phineas,' said Dumbledore quellingly."
Now the truth of the matter is that I have a great fondness for adverbs. I use a lot of them myself. But not as many as J. K. Rowling, whose characters are forever saying things "tartly" or "stubbornly" or "soothingly." And sometimes, as in the example above from page 259 of the latest Harry Potter opus, "quellingly." It doesn't wear well over the course of 652 pages.
And what's this about "apparition" classes? Harry and the gang have to learn to "apparate," which is teleporting by another name, so wouldn't they have "apparation" classes? I don't think this is Rowling's fault. It's bound to be a copy-editor's call, and it just seems wrong to me.
I have one other quibble. The book is too much of a set-up. You may be thinking, "Gee, Bill, that's a clever comment. What do you think the other five books were?" OK, you have a point. Still, I thought the ending was a little rushed. Lots of set-up and not enough pay-off.
All that being said, I enjoyed the book quite a bit, and I'm looking forward to the seventh and final one. I don't understand those people (and there are a lot of them) who say, "I'm an adult, with sophisticated adult reading tastes, and I just can't read those childish books." I have nothing against adults, and I'd always hoped I'd become one (didn't work out). We need adults to run things (too bad they're not in charge, though). But you'd think even an adult could enjoy a book written for young people. Maybe some adults can. If they can't, there's always John Irving's new novel, which is much, much longer than Rowling's book. The adults are welcome to it.