Easy A, 10/10.
It's totally not worthy, in all honesty, a 10/10, however it done exactly what it needed to to make me fall in love with it. It's a very funny, very tightly written and adorable film that knows it's type of story and audience incredibly well. I wouldn't be terribly surprised if a lot of its audience don't know John Hughes, and films like these rarely come around now, or if they do, its in the form of "Superbad". Whereas "Adventureland" used the darker edges of the Brat Pack and Hughes films, this embraced the more comedic sensibilities topped off with extra amazingness (i.e. romance?). Emma Stone isn't Molly Ringwald, but she's incredibly close.
Great cinematography, too! The film was mostly Emma Stone non-stop, but her supporting players were good. I know a lot of them from various films and TV shows, so there was nothing surprising, although they were necessary for the world-building going on.
A good comparison of the writing would be the "Scream" films written by Kevin Williamson. In them films, the characters know horror films and their tropes well. The same happens with this, except replaces horror with brat pack/teen drama.
It was directed by Will Gluck, his second film, apparently; and his third: "Friends with Benefits" also sounds good.