Personally I feel as though what the movie gets right is that it stays real. It dives into the inability for people who just met to unravel their entire lives to each other off the bat, but slowly start to show more of each other's backstories (everything that got them to Grand Central Station) as time goes. It guides us into how two people's hearts can tie into one another, notwithstanding the ties held prior to their encounter, ties which ultimately make us see them as brave for making the decisions that they do as the movie progresses. The length of the night (relative to the length of the movie) comes into question close to the movie's end, but if that's a problem that only comes up at the end, then one would assume anyone would get sucked into and enjoy the movie's plot. The Linklater "Before" trilogy is a benchmark, but the movie is a beauty in its own right. Two people's true natures slowly become apparent, and we relate to them more and more, and that's what a good love story is.