Mean Girls
The plot: Cady arrives from being home schooled in Africa to go to high school for the first time. It's an interesting experiance. She soon founds herself hanging out with the popular kids named "The Plastics" as an insider but ends up becoming one of them.The good: Lindsay Lohan puts on a decent enough performance, it's actually slightly more innovative than most films of the genre.
The bad: Still your classic multi-genre piece with drama, comedy and romance, nothing majorly new.
Conclusion: Good one for the kids and teens. Otherwise don't bother.