How much time do you have?
And actually, have you read the books? I found that people who didn't read the books seemed to like it more. Case in point, I got into an argument with my friend after the movie. She liked it and was trying to tell me why she didn't need to know the things that were left out. You don't know what was left out, how can you tell me it wasn't important?
But I digress...
1) The intro with Harry in the train station. It was stupid and pointless.
2) Dumbledore didn't act like Dumbledore. He sends Harry to stay with the Weasleys without any prior warning. They're just wandering around the house like 'is Harry here? Why is his stuff here?' I know this seems like a small point, but it was completely out of character, Dumbledore was always unfailingly courteous. You should act least have the characters act like the characters.
3) Fred & George's shop. Ok props for that. That was cool. I also think they did a good job w/ Jim Broadbent as Slughorn.
4) That horrible scene where they burned down the Burrow. I read that they did it b/c they were trying to truncate things in the final movies and needed a reason why they wouldn't use the Burrow as a location. But then they did, so that was out. Also, the director/writer/someone felt they needed some action. So they added a pointless and boring chase through the fields. And it doesn't make sense b/c the Burrow was under all sorts of protective charms, so the Death Eaters wouldn't have been able to be there anyhow.
5) The whole way they just started telling us stuff. Like Mr Weasley providing the revelation of the Vanishing Cabinet. Just lazy writing. Actually, a lot of lazy writing throughout.
6) The scenes in the cave were cool, no lie. Gambon earned his paycheck on that one.
7) The scene where Malfoy traps Dumbledore and Harry is just waiting in the background. And then Snape comes by and puts his finger over his lips. Really? They couldn't have found a better way to do that?
8) They completely eliminated the battle between the DE's and the DA/Faculty. If they wanted action, here was a good time to do it. Instead, Snape and co just stroll out of Hogwarts as Bellatrix breaks ish up. (I won't say too much bad about her though b/c I love HBC as Bellatrix)
9) As a matter of fact, the whole film, particularly the escape just lacked any sense of urgency. Like.....total snooze. Even when harry is chasing Snape, it's just hurl a spell or two and then that was it. Just terrible.
10) And then the final conversation between Harry and Hermione. "You're a great wizard, but you're really thick" Gag.
So....yeah. Got that off my chest. And I'm probably missing a lot more. I finally just had to learn to appreciate the little moments (and there are some nice little moments) in the film. But I can now watch it without cussing, but it is never a favorite.
Oh I forgot
11) I feel like they did a shoddy job of exploring/explaining the memories and the Horocrux and why they were important. Then they had to do a rush job in DH1. Really I felt like they tried to make the film into a teenage romance or something instead of letting it be great.
OK I'm really done now.