My list is this:
Half Blood Prince: Personally, I love it. I cried when Dumby died and yelled when Snape left. And it made my friend eat his words when Malfoy was a deatheater.
Order of the Pheonix: It just made so many things change and it developed Sirius as a character, of course he died...
Goblet of Fire: Wow, the Triwizard tournament just made me cheer, scream, and get a little tear.
Chamber of Secrets: Tells about Voldemort's past, what's not cool about that?
Sorcerer's Stone:
It was fine starter book, no real wow factor.
Prisoner of Azkaban: No wow factor at all.