Disclaimer, I have neither read nor seen any movies related to Harry Potter, so if I leave out something important, my bad. This is a personal review of the movie. This review will contain some spoilers, so be warned.
Story
Harry Potter, who's about to be 17, and his two friends, Ron and Hermione, are trying to find the 3 remaining Horcruxes which are the Achilles' heel of the main villain, Voldemort. Through the quest of finding these Horcruxes, the three friends face all sorts of dangers, but like all stories, the good is victorious and evil is vanquished.
Themes
The most obvious theme is the fight between good and evil, but one unique thing that this movie brought to the table was the question: where do we go when we die? When Harry was struck down, he woke up in a cleaner and much brighter London King's Cross railway station where he hooked up with Dumbledore. Come to find out, the place was a wizard's "Purgatory" but the wizard had a choice to go back to earth or go to a better place. Besides having that religious theme in there, the movie used two other themes: sacrifice for the greater good, as well as, friendship is better than power.
Presentation
The overall mood of the movie was of despair and helplessness and was portrayed perfectly by the lighting in each scene. As the movie came to a close, the lighting and mood slowly became bright and happy. Each fight scene made you think you were part of it with the amazing sound effects doing their part, making you feel the impact of each blast fired. While some people would say that there were too many silent moments where no music was present, I think it made the scene even more impacting. Finally, unlike some movies that are an end to a series, this movie wrapped every loose end into a nice package. So much so that, for someone who didn't know anything about Harry Potter, I was satisfied and could follow it clearly.
Verdict
So overall, it is a great movie to watch and the diehard fans will probably agree with me and it gets a 8.5 out of 10 in my book.