Unpopular Opinion... let's make it popular?

Unpopular opinion: Half-Blood Prince is my favorite, and the best Harry Potter book. It's got backstories, Horcruxes, plot twists, and a general angsty vibe of aging teens.
Also, the chapter breaks are perfect as always, and this book is of a very good length. Not exceptionally long like Order of the Phoenix, but then again, not exceptionally short like Sorcerer's/Philosopher's Stone.

My favorite quote: "...just like Dumbledore had left the school, had left the world, had left... Harry." (IIRC), from the end of the chapter The Phoenix Lament.