To be honest i thought that the movie was great,i have been a very big fan of Louise Rennison since i was in my mid teens and i love all her books. The movie entitled everything which the books stand for which is comedy,romance,teen drama and friendship.
Don't feel that with out reading the books you would not understand what the movie is about because everything is explained from the snogging scale to why slim is called slim.
Although i feel that the movie is somewhat lacking when it comes to Georgia's vocabulary because she uses terms which non book readers would understand. However if you are devoted to the books you won't hear such words staga 14 or mutti or fatti but just school, mom and dad. Which kind of leaves the die heart fan unsatisfied.
The cast was well chosen and the story line did change a little bit when compared to the books but it still included all the important bits from the books and now i'm hoping that their might be a sequel at some point in the future.
Its worth watching.