Not surprisingly, a movie written and directed by Greta Gerwig, based on her own experiences as a high school senior, is a lot like a Greta Gerwig performance. It sneaks up on you. It’s sly, a little sideways, grudgingly poignant in places, and uproariously funny when you least expect it,
Granted, Gerwig’s not exactly a household name (like, say, a judge on “Dancing With the Stars.”) But you’ve seen her — mostly in well-received indie movies like “France Ha,” “Maggie’s Plan” and “Mistress America.” You may not like any or all of her films (I don’t), but her work is always interesting. And I mean interesting in a good way, not in that uncomfortable I-know-I-should –like-this-but-I-just-don’t way.