Staid, even-keeled Madelyn gets the shock of her life when she discovers, quite by accident, that her husband of many years is cheating on her with a much younger woman. Then, through a series of complicated events, she winds up as the confidante and adviser to her husband's mistress who has no idea who Madelyn is. In fact, the two women both make a pact - Madelyn with full knowledge of what she's doing and Lucy wholly in the dark - that they will leave all their major life decisions up to the other person - an ostensibly more dispassionate and objective person - so as to avoid incurring any more self-inflicted mistakes in their lives.
Written and directed by Joan Carr-Wiggin, "If I Were You" plays much like a modern-day Feydeau farce, its humor based on a complex web of interconnected coincidences, misunderstandings and strategically withheld information. It's a clever, insightful little comedy that, by carrying its ironies and implausibilities to an almost absurd level, manages to make us face - and, even more amazingly, laugh at - just how real and cutting the pain caused by infidelity, romantic relationships and even platonic friendships can be. But the movie also deals with such heady themes as deceit, betrayal, hypocrisy, self-worth and a woman's place in the world, all without breaking a sweat. In fact, this becomes a growth experience for Madelyn who soon learns that she has a purpose and identity of her own apart from wife to a cheating husband.
It's true that the movie sometimes feels like it's a beat or two off in its more broadly comic moments (especially early on the film) and the ending rates as a bit of a cheat and copout, but those weaknesses are easily overlooked amidst fine performances by Marcia Gay Harden, Leonor Watling, Joseph Kell and Aidan Quinn and an overall wisdom about how life works.