It doesn't pretend to be anything more than it is - a slice-o'-life domestic drama/dark comedy of manners savvy about its limits and sufficiently disciplined to keep its convolutions to a credible, impactful minimum.
"Union Square" has the busy, hemmed-in talkiness of a theater piece, with too much forced to happen in too short a time. But it also has a lively, nervous energy and an expansive sympathy for the mismatched women at its heart.
There isn't much to Union Square, but the movie does understand how people want to love their families on their own terms, forgetting that their families may be the only ones who really know who they are.
Often feels like an acting exercise documented on video for teaching purposes-lots of unnecessary histrionics and ostentatious zooms, with both the story and the improv-like dialogue predicated on contrivances and glaring improbabilities.