At the Hollywood Reporter, "Extremely Loud and Incredibly Close: Film Review":
Emotional fluency and literary pretense go hand in hand in Extremely Loud & Incredibly Close, an affecting, well acted tale of 9/11 trauma and a boy's effort to piece things together after his father's death. A self-conscious prestige project with weighty thematic elements, a tony literary pedigree and top-tier actors, director Stephen Daldry's fourth film is dominated by the performance of a 13-year-old with no previous acting experience, Thomas Horn, who enables his character's pinball intellect and inchoate emotions to pulse through every scene. While the subject matter will keep some prospective viewers away, many who do come will be emotionally wrenched by the treatment of loss and the interplay between parents and child, indicating good commercial prospects in most markets.
I can only think of one other big screen epic of this sort, "World Trade Center," and I'm surprised we haven't had more. And "Extremely Loud and Incredibly Close" is another film that's on my list of movies not to miss.