Set in 1906, Eugene O’Neill’s coming-of-age comedy Ah, Wilderness! seems hopelessly dated, and I have a feeling it wasn’t that funny when it was first mounted 65 years ago. But the revival is worth seeing for the sharp performances of the delectable Debra Monk as the wise but clownish matriarch; Craig T. Nelson (TV’s Coach) as the benignly boorish father; and Sam Trammell, whose indelible performance as a self-consciously surly intellectual kid (O’Neill’s dramatic stand-in) has made him Broadway’s flavor of the season. B