This is the great, climatic end to the whole Harry Potter series, and the film does it justice. My only query is whether the 3D element added anything to the overall viewing pleasure, and on the balance I would have to say yes – even though it is mostly in the background, and only perceivable as depth of field.
It's a little scary, as with most of the series, but still what I call an excellent family movie, and to boot the ending is not predictable and works!