A few things to consider...
Ok a couple of things.
1. A lot of people say that this movie is a load of crap because in real life a guy like Adam would never fall for a girl like Mia. One of the main things in society people complain about is stereotypes that we can't seem to get rid of. This movie definitely defines the stereotypes. But for all those people who said Adam would never fall for a girl like Mia, you are proving to be the typical, sterotype-obsessive people. And you know what, i agree it is very unlikely, but somewhere in the world it has happened, you can guarantee. A lot of people think, I dont want my children seeing it for that reason, and what can it hurt? We complain about stereotypes all the time, and now we are restraining children from seeing it for that reason. It's only a movie!
But, on the other hand, there is sexual activity, and it is not appropriate for all children, depending on how mature they are. It also has some devastating themes, so make sure your child is ready. Adam and Mia share a deep love that is not always understood in teenagers. They have a sexual relationship as well, which is not a great message for teens, but if your child is mature enough, than this movie is moving.People seem to think that the message was; I can follow to what ever comes next, or I can go back to make out with my hot boyfriend. If you have read the sequel, you would no that's not the case, but we are not talking about the sequel.Personally, I believe that Mia's decision is she can follow to the next life, or she can move on and resume her musical progression. But, it is your opinion, and if you think that a child is not going to take it that way, I would think twice.
All in all, it was a reasonably good movie, with some good messages. And pack some tissues!