I saw it last night and I loved it. Much better than Goblet of Fire, in my opinion. It played out more like a film than anything else so far, I reckon, and it was easier to pick up on the main themes in this one.
I really liked seeing the DA scenes, though more would've been great. Umbridge was totally evil, as expected. And Luna - she really did fit the part well. Lots of references to Nargles though.
The thing I slightly missed was the lack of Hermione, Ron, Ginny, Luna and Neville actually duelling in the department of mysteries, but I suppose there wasn't enough time in the film to go into all the different rooms, battle separate death eaters, etc. I really liked the flashbacks though at the end, where the whole "love triumphing over evil" comes into play. It could have been very cheesy but it kind of worked out OK. And Dumbledore's duel was cool.
Also, special effects ++.
... Yeah, what can I say. I really loved this movie. Four stars for me, Margaret.