If it's crap ... We'll tell you
Okay so Harry drops the stone, goes to face Voldermort and dies.....but then comes back through what can only be told as his choice since he had the choice to either follow Dumbledore or stay put....he stays put, revives and then feigns death..... and when the time comes he pops up and goes right back to fighting.....WAIT WHAT!
No seriously WTF! HOW DID HARRY LIVE FROM A DIRECT HIT KILLING CURSE!? why would it on only kill Voldermort's "soul" and not him as well? explaination: NONE! there is no reason other then sheer force of will that harry potter survived the killing curse directly to his chest! I get the whole feigning death thing even as it's said in the book that Mrs. Malfoy used harry's "death" to ask if Draco was alive and in response lied for Harry.
Update: For the people who want to say "Well the Elder Wand would never harm it's owner" IT DID HARM HARRY it knocked him out leaving open to attack physically and magically, in the book it knockes out both him and Voldermort but in the movie it only "Kills" harry. If Voldermort walked over and smashed his head in with a rock or hit him with another blast we'd not be talking about this.
Oh his and Voldermort's soul merged some what so unless Voldermort's Horcuxs are gone (Which the one inside harry did instead of harry himself or BOTH) Harry would live. How much sense does that make when Voldermort JUST KILLED APART OF HIS SOUL the thing that supposedly protected Harry from the thing that was suppose to kill him! It makes no sense.
Then WTF happened to Voldermort at the end there? Okay since all of his Horcuxs are gone he just dissipates? no final struggle as a mortal man? no duel with harry with harry wielding the elder wand? just vaporizes and done..That's the ANGRY! ranting part of this
I had a problem, this however is PURELY SUBJECTIVE, with the ending. Now the ending the fact it wasn't even like "Oh it comes full circle" because coming full circle would basically show how far Harry's come and the family he has gotten since, what the movie and book did was basically have Harry playing a supporting role to his son Albus.
Solutions (for all aspiring writers to make sure you don't get a similar angry rant)
For how Harry didn't die, this is easy:
The series is full of Deus Ex Machinma moments however, this is the only one that angered me and overall made me not think this movie isn't great, as at first due to not paying attention I believed it was the resurrection stone, meaning harry found the answer to his upcoming problem at the last minute.
-My Suggestion for that:
--Never ever give the item to get out of the situation ,unless the solution requires multiple items from through out the story to be combined to make the solution, at the last minute.
--If you go with mutliple items with the final piece being found at the last second. Make sure it's obvious these have some use and don't bring up that there are these other items unless it for their known use until it's time for them to be put together.
However I found out that it was just harry some how lucking out due to the piece of Voldermort's soul making sure he didn't die though the killing curse also killing that part of Voldermorts soul but keeping Harry alive. Meaning a piece of something harry didn't understand or know was there protected him.
My Suggestions for that:
--Make sure never to have the character being killed be saved by something we didn't know would protect him and die, leaving the hero actually one up on the villain as the villain is now less powerful due to that piece protecting the hero being a source of the villian's power. (Example of this being used in another situation: Joe tries to kill Jim but Joe's force field messes up saving Jim but leaving Joe weakened though neither Joe or Jim didn't even know the force field could mess up like that. Sounds kinda stupid huh?)
--If you're going to have an unknown source of power protect someone set it up and set up the way it may infact protect them (Example. if the Killing Curse had been described as being a curse that targets the soul of it's target killing it) or have it a source that protected the person before (Example, if some of Lilly's protection from when she died had grown within Harry and then manifested to protect harry once again as well as cleaning out his soul of Voldermort. That would be more emotional impacting).
This is harder to explain as it's unexplained in the movie but in the book it's explained that his Killing Curse that he was casting reflected killed him. However when you consider that all Harry cast was the disarming charm it makes it all seem.....very very lame. the Villains own powers turned against him I can understand, but when you consider the final fight was just harry getting the wand back and the villain being overpowered in one motion, it's very anti-climatic.....
-A fight scene
-A classic scene where the hero has defeated the villain and is walking away but the villain tries one last attack but the hero or an ally of the hero kills the villain (on purpose or accident) stopping them once for and for all.(Example:Voldermort grabs one of his Deatheater's wands and attacks but harry deflects it accidentally right back and kills Voldermort)
-The Villain makes one last desperate power play and the hero will have to stop him or someone else will get hurt (Example Voldermort attempts to make another living Horcrux possibly out of Ginny)
The ending :
As someone that isn't a fan, I can't excatly say how a fan would want it to close but I at least have a good full idea of how to bring it "full circle". First off the character can be kept, the timing can be kept, but one thing needs to change, the setting.
How I'd picture harry potter coming full cirlce:
It's an empty street in a muggle neighborhood, a car pulls up to a nice houseyou see the feet of one person get out and approach the door and followed by two other people the one in the middle being a male the other two female. the door opens to an older harry greeting Hermoine and Ron with their daughter Rose. They come in to see Albus getting a few tips about Hogwarts from his brother James, a mention of "Mr.Longbottom's class" before they're called to the table by their sister for their mother. You see a picture of the Malfoy family on the newspaper posing together as they cut to the Dinner table with the Potter/Weasly/Granger family putting food on the table and sitting together and Harry looking around at all his family and then smiling and it cutting to the credits.
The symbolism is basically the boy without a real family grew into a man with a family greater then he could put into words.
With that I bid you farewell
Mind you this is about the flaws of the Movie as looking critically coming in without knowledge of the book
So all answers of "It was explained in the book" doesn't really change the fact it wasn't explained in the movie.