Greta Gerwig is the saving grace of this comic case study of a yearlong meltdown. It's almost enough. "Lola Versus" is a comic case study of a yearlong emotional meltdown for an about-to-turn-30, angsty, artsy New Yorker. While that might not sound entertaining, it is made so by star Greta Gerwig, who inhabits Lola with an endearing ease.