‘Love Letters’ on Broadway with Brian Dennehy and Mia Farrow is a thin missive

What’s the minimum requirement for putting on a play? Is it performers? Sets? Memorization? Surely, at a minimum, it’s acting, right? More than a quarter-century after Love Letters premiered, A.R. Gurney’s charming ditty of a play has landed on Broadway with virtually none of the characteristics of what you might expect in a play. While the script is clever, the thinness of the spectacle — which the author himself insisted upon — is sadly deflating, as if the audience is being asked to watch an early rehearsal instead of a polished jewel demanding $60 for even the worst seats.