Love Letters ****
By: David Sheward Brian Dennehy, Mia FarrowThere has been a certain amount of carping about the revival of A.R. Gurney's Love Letters, the charming 1988 Pulitzer finalist which requires only two actors, little rehearsal time, and minimal design elements (The only setting is John Lee Beatty's elegant wooden table, lit warmly by Peter Kaczorowski). Gurney specifies that the performers should be reading from scripts so …