This movie is an atrocity.
It is a butchering interpretation of an excellent book and an earlier movie that is also very good. The only element that the "updated" version of the work has with either the book or the earlier film is the presence of twelve children. Now, I don't expect adaptation films to be carbon-copies of the original works, but I do expect them to be as good. I didn't ask for this movie to be realistic, but I did require it to be remotely funny. I was disappointed, to say the least.
What repulsed me and my fellow viewers was the fact that this film is yet another in a recent genre that apparently seeks to portray parents, particularly fathers, as idiots, and children as the only members of the household with a clue. If you find humor in parental idiocy, then this is your movie, because there's plenty of it. The plot is based on the tensions between the father and the children, and between the children themselves. It is about a household trying to destroy itself.
There's enough of this going on in real life, so I don't see any reasonable motivation for making it the butt of a joke. I just can't seem to find humor in blatantly defiant and disobedient children (even though the father's irresponsible behavior almost warrants it). However, I did laugh at seeing Ashton Kutcher's crotch being mauled by a dog, but Kutcher's crotch being mauled by a dog would be funny in any movie.
The movie gave me a headache, and the fact that everybody kissed and made up at the end didn't make it go away. To the analytical viewer, Cheaper by the Dozen is simply a blasphemous rip-off of a good book and a good movie,and a psychotic portrayal of how cynical and misguided the American family can be. To anyone else, you might want to settle with saying that it's just a really bad movie.