It was alright compared to some of the other films out there now, but certainly was a disappointment with regard to the series.
I thought they spent a lot of time on things they could have easily passed over (what was with the dance instruction crap? and that going-on-forever dragon scene?) and not enough time on important elements of the story, like Dumbledore's talk with Harry at the end. No explanation of what happened with the wands in the Harry/Voldemort duel. If I hadn't read the book, I wouldn't know what happened there. Dumbledore mentions "Priori Incantatem" but doesn't bother to explain it in the film.

Oh yeah, and Michael Gambon as Dumbledore was crap in this one. Too bad; he was alright in the last one. Mainly I thought he was too serious and crabby. The loveable quirky Dumbledore was gone. He was needed as he is in the books.

I agree about the kids though. They are really developing as actors. Too bad none of the other characters were showing their skills as well. Maybe too much emphasis on SFX for this one.