We don't use only 20% of our brain we use 100% and there is no such thing as a four digit IQ so the premise can't be true.However I don't go to movies to be educated I go to be entertained and this movie did that. It also had some very unusual visual effects. The ending was interesting.
I have always noticed that when I movie comes out that it patterned after a book, much of the events are left out. With this movie, nothing is left out. The plot line follows the first 15 chapters of the Deathly Hallows with a great transition into part II. It is essential for people who have read the book to see the movie. You will be amazed with the action, special effects, and adherence to J.K.'s novel that the other Harry Potter movies have not had.