Okay, so 87 million might be an exaggeration, but not by much. But I'm going to toss my opinion out there anyway!I'm not going to shy away from spoilers, since I'm assuming most people know how things end. You've been warned! If you don't know what happens at the end of the story, don't read this review.
To give a little context: I've read all the books, and see all the movies. My favorite out of all the movies is the third--I'm not a huge fan of the first two. This is partially because of the terrible acting and cheesiness (the end of the second one makes me cringe), and partially because it looked so different from how I pictured it. The first two were also so obviously kid-oriented; I think the latter ones do a much better job of balancing the humor and magic of the books with the darker aspects. So even though the last three movies haven't been as faithful to the books, I like them a lot better.
The movie hit all the important points for this particular storyline: Slughorn and his altered memory, the trips into the Pensieve, Malfoy's scheme with the vanishing cabinet. Harry finds the used potions book, and uses the sectumsempra spell; he accompanies Dumbledore to get the Horcrux, watches Snape's apparent betrayal, and discovers the Horcrux is a fake. Sometimes the ways we get there are different--most notably, we see Malfoy's experiments with the cabinet and can see all along what's coming, even though none of our main characters would have knowledge of it--but the main points are all there.
The side plotlines of the relationships were fiddled with; Ron and Lavendar are hilarious, but Harry and Hermione bonding over their unrequited love for Ginny and Ron was created out of whole cloth. Harry and Ginny's relationship is boiled down to one kiss, essentially, and that's about it. Tonks calls Remus "sweetheart" at one point, but other than that there's nothing about their relationship at all.
A couple of other scenes were added, particularly a scene Bellatrix and Fenrir Greyback show up at the Burrow and lure Harry out of the house. Although it didn't happen in the book, I thought it was a good addition--mostly because there was so little actual action in the book until the very end. The fact that the Weasley's house is torched is going to cause problems later, though, I think.
Speaking of problems ... I'm interested to see how the heck they arrange for Harry, Hermione and Ron to find the rest of the Horcruxes, considering 99% of Harry's conversations/Pensieve trips with Dumbledore were completely left out. We don't see young Tom Riddle visiting the old lady with the Hufflepuff cup, or his mother and her family in their squalid hut. There's also nothing about nonverbal spells, Bill and Fleur, the Dursley's, Kreacher or the house on Grimmauld Place. Sirius is mentioned once, in passing. I know a lot of things would have to be left out; it's a very long book. But I'm not sure how they're going to weave all the pieces together for Deathly Hallows.
My biggest problem with the movie, though, is that the end felt very, very rushed. There was no battle in Hogwarts; Harry's duel with Snape was all of two spells. Snape tells Harry he's the half-blood prince but not why--not that it seems important in the scope of the movie. Dumbledore's memorial service is completely left out, as is Harry's ending conversation with Ginny.
All of this isn't to say I dislike the movie; I thought it was pretty good. It was very visually interesting, and it was funny and suspenseful. I'm not just sure how they're going to bridge the gap between this movie and everything that happens in Deathly Hallows.
Oh, one last thing--Tom Felton, the guy who plays Draco, does a great job.
