I was a little upset that the coins the used for the D.A. were left out. I'm okay with some of the things they condensed- aspects of Harry and Cho's relationship, the way the D.A. was busted- It's a long book, there's no way you can go into detail with everything. But... I was dissapointed with the fight scene in the ministry. They left a lot out from the book, and come on... the movie's already long, you're telling me you can't spend the extra 5 or 10 minutes to keep some of the really cool fight scene stuff in? And... in the book, they didn't all just walk out of the ministry, some of them were seriously injured. I think, with the 4th movie ending in an actual death, it would have been very appropriate to show some serious injuries in the 5th battle (and possibly to explain the veil Sirius fell behind? Seeing's how it wasn't even the "Avada Kedavra that killed him in the book...)
Okay, okay... gotta get off the nerdy high horse...