Something that stuck out to writer-me is how much HAPPENS in this book. It's very active, each chapter bringing some new, exiting adventure. No wonder so many readers love it!
My favorite passages come late in the book:
"The truth." Dumbledore sighed. "It is a beautiful and terrible thing, and should therefore be treated with great caution."
"Your mother died to save you. If there is one thing Voldemort cannot understand, it is love. He didn't realize that love as powerful as your mother's for you leaves its own mark. Not a scar, no visible sign... to have been loved so deeply, even though the person who loved us is gone, will give us some protection forever."
... and now on to HARRY POTTER AND THE CHAMBER OF SECRETS!