Easily could have been 10 times better...
Without those bloody accents! The child actors were brilliant but their performances were ruined by poor direction--the decision to make the characters speak with terribly fake Polish accents! It made the movie seem like a joke and took so long to get used to I found myself unable to pay attention to the true intelligence of this film until the end. Neither did the accents add ANYTHING to the movie--they were speaking English, for goodness' sakes, not Polish, so why even bother with the accents? It's not as if Poles speak their own language with such halted voice.
other than that, though, a very honest and well-crafted movie.