Children in American movies are so unrealistic...
Why is it that kids in American movies and TV shows are always either impossibly cute preeners or wisecracking miniature adults (or both, as in this case)? I'm sure Dakota Fanning is a very talented actress, but the way her character is written, judging from the trailer, she's not like a real kid at all. Kids can be cute, kids can also be incredibly mean (like life - nasty, brutish, and short), but kids do not deliver one-liners or snippets of wisdom to their clueless elders. Possibly the only American director who does a good job portraying kids is Spielberg, and even he has a tendency to get gloppy.
Also (my pet peeve) mainstream American movies, esp. compared with their European counterparts, are waaaay too finicky and unrealistic about showing child sexuality. Must be the Puritan legacy. Also a general American tendency to idolize children, which I've never understood.
And by the way, I'm American, and proud to be one...in most respects.
Watch "About a Boy" for a much more realistic picture of children and how they behave.