First things first: I haven’t read a single Harry Potter book. This is NOT a book review. I’m just giving my opinion of the 6th Harry Potter film, so don’t get your knickers in a twist. I’m sure the books are great. Secondly, I should mention that I have seen the first four HP movies, but not The Order of The Phoenix (No.5). So I’ll admit I’m not the most highly briefed person going into The Half-Blood Prince.
Let me set things up: A creepy, Voldemort induced storm appears form nowhere, out of which pops some death eaters which bring down a busy walk-bridge by flying next to it. An article in a newspaper Harry is reading in the next scene tells us that some people died in the incident. So I guess falling a short distance into water is fatal now. In a subway coffee shop, Harry hits on a waitress, who for some reason is all up ons. But as he's about to meet her at the end of her shift, Dumbledor c@#k-blocks Harry and magics him off in clear view of everyone, yet no-one sees it. (It's magic!) He takes Harry to see retired Hogwarts professor Horace Slughorn in the hopes that the prospect of teaching the one and only Harry Potter will lure him back to the school. It seems that old Slughorn is privy to some information that could help Dumbldor in his quest to ruin Voldemort's shit, once and for all. And it goes on from there. A bunch of what you'd expect from a Harry Potter film takes place. Including but not limited to: Ron makes out with a girl. Harry makes out with a girl. Hermine gets upset about something. They play some quidich and later, Harry and Draco cross wands.
