The wait proves to be a wholly diverting one in 'Outside Mullingar,' which represents Mr. Shanley's finest work since 'Doubt,' the winner of both the Tony Award and the Pulitzer Prize in 2005. This isn't to suggest that they are equally sturdy or significant plays. For all its satisfactions - which include supporting performances to savor from the wonderful Peter Maloney and Dearbhla Molloy - 'Outside Mullingar' is a lighter, slighter play, a softhearted comedy freckled with dark reflections on the unsatisfactory nature of life and the thorns of love. But Mr. Shanley's lyrical writing, and the flawless production, directed by Doug Hughes forManhattan Theater Club, give such consistent pleasure that even though we know the equations that define romcoms will add up to the familiar sums, we are happy to watch as they do.