Not nearly as good as the first two, but still a good movie.At first we were unsure of taking our 3 1/2 year old to see the movie, but we did and she enjoyed it.Of course, there are many things to discuss with your child before or after the movie, especially if you take a younger child. There is a vicious dog, dementors (whose name says it all), a werewolf, an animal execution, mild violence, deceitfulness, talk of murder and fear, and in the beginning, Harry runs away from home. All of these scream "know your child". If they scare easily you may want to wait a year. These are also other things to discuss,such as your views on the subjects and your children's ideas about them, what it means to them, etc.
One thing we always remind our daughter is that none of it is real. It is only "people pretending" to do these things...actors, acting it out.
One thing in particular you might talk about with your child is the part where Harry runs away. We all know Harry does not have a parent (or guardian) that he can talk to and work things out with, but we can remind our children that we are here to talk with - anytime, about anything, and remind them of the dangers out there.
Again, this is a good movie, just don't expect it to follow the book as you might like. If your children or friends haven't read the book and you have, you might explain why Harry's patronus takes the form that it does. There are also several other points that the movie leaves out that may make it a bit unsatisfactory.
And don't forget......Have Fun!!!!