YES, YOU ARE THE CHOSEN ONE..!! This movie showed that Harry(Radcliff) has taken a big leap from last one, and acted like a chosen one. The passion to achieve his ultimate goal is still there, but the juvenility is slowly getting replaced by responsibility in his character.And Radcliff has portrayed that subtle change very well. This HP movie has learned from the mistake of its predecessor(Order of Phoenix) in the series. The story line, though trimmed excessively, has been kept simple, touching all the main points. It helps a movie-goer to understand the movie without memorising every nitty bitty details of the book.
Also this movie portrayed the cross-over age of all the kids-turned-young adults very well. Ron(Rupert) and Hermione(Ema) delivered masterfull performances. Hermione's emotion was never seen in such volume in earlier movies. Weasley twins did not get that much attention, though their newly opened magic shop is an instant hit among hogwarts student.
And yes, professor Horace slughorn. Great choice, great execution. The best part I liked in the movie was the way the memories was shown to Harry in Dumbledores office. Much more crystal, easy approach, and vivid conversations. Young Tom Riddle was good, and possessed the killer look in those little eyes.
All in all, a satisfying movie after the blunder in Order of Phoenix. Thank you, David Yates