Gabriel Kuttner, Liz Hayes, and Daniel Berger-Jones get romantic in Love Song. I admit that up until recently I kind of hated playwright John Kolvenbach. I detested his Fabuloso, and felt that his On An Average Day should really have been credited to "Harold Pinter, David Mamet, and Sam Shepard, as told to John Kolvenbach." So I dragged myself to Orfeo Group's current production of his latest, Love So…