If you are angry at this film, then obviously it's good
So many people here are angry at this film - how did they let the bad guys just kill everyone, how could they kill a child, why didn't the family fight back, what the hell was this rewind scene!
If you feel such emotions about this film, then you are reacting exactly as Haneke (the director) wanted you to react. Going against your expectations and making you angry was exactly the point of this film.