Here's my brief reaction to HP7 (the book), which I never got around to posting a couple of years ago. (Not really spoilery, but if you haven't read it and you're going to, you might want to skip it just because it might color your interpretation.)
So in brief, I liked the story (the events), but I didn't like the way it was told. It was the only one of the books where it was a major hindrance that everything is told from Harry's point of view, and you only find out about events outside his presence when he does (with the exception of a few framing events.) It's barely noticeable in many of them, but in Deathly Hallows many major events, including the deaths of several important characters, were, it seemed to me, drained of most of their emotional impact because they happen over there somewhere, and we only learn about them when someone exclaims in Harry's presence that they've happened.
I had hopes that the movie makers would have the sense to fix that, since it's a visual medium, and "Harry reads the newspaper" would be much worse on screen than in print. When I saw the "running through the woods" posters for Part 1, I thought "Oh, no..." Part 1 did pretty much stick to the book (though I haven't re-read it to know how closely) and I was worried that it was one of those situations where the author is too powerful to be contradicted. I actually enjoyed it well enough, but if the filmmakers hadn't been able to compensate for "we're not where the action is" with a pretty travelogue of scenic England and Wales, it would have been much worse.
Part 2, thankfully, departed further from the book. Again, I haven't re-read it to know exactly how far, but far enough that it was better. I liked it, but I didn't love it. As for the character deaths, the film did a better job at creating a sense of the fog of war as the reason why we weren't seeing them, rather than just because it's all about Harry. I still think Fred and Remus and Tonks deserved better, but it will do.
(Okay, apparently I'm incapable of actually being brief unless the medium is enforcing it...)