Maybe the most stringent of the series, and as everything is speeding up towards the finale it is still very entertaining in a spectacular kind of way. The "19 years later" part was so bizarre that it made me feel like having been cheated for watching any of the other films. It felt like someone (Rowling?) pulled the emergency break - no sequels, please. And for that I'm thankful. It was great while it lasted, and Marvel will suffocate me with franchised sequels for the next 15 years - it's nice to know that at least somebody summons up the courage to come to an end.
For some reason I suspect that Harry would have had to die too (or at least the wizard inside him) to make this legendary material.