Strengths: This was a sweet tale about a salty young woman who wasn't willing to give in to the mores of her time. Supportive community, bewildered father, and a good secondary story about a classmate make this a fine choice if you need Depression Era tales or are feeling nostalgic for The Waltons.
I'm not a fan of obnoxious main characters, but know that they are often popular. Characters like the ones in The Great Gillie Hopkins or Gertie's Leap to Greatness are attractive to young readers because they exhibit behavior that is frequently frowned upon in real life and show how these actions don't always end well without the readers having to experiment with them on their own! I don't think that readers really WANT to be like Junie B. Junes, but they like to see the humor in her predicaments.
This is similar both in time period and difficulties of the protagonist to Rosengren's What the Moon Said, Golden's Every Day After, and Kinsey-Warnock's True Colors.