Its all-female Supreme Court buys a lot of goodwill, but even so, it’s a tricky ask to get audiences to be comfortable with the relentless playfulness, artificiality, and earnestness of “Barbie.” The film’s tone isn’t quite everything (though it encompasses a lot), Greta Gerwig’s take on Mattel’s IP contains everything from a beach battle ballet to several quests for self-actualization to the ultimate trans-dimensional travel montage.