I saw Miss Saigon once around three or four years into the first Broadway run, and that really is my total acquaintance with it, except for seeing the segments on the Tonys so . . .
I completely see why playing Jane as unpleasantly as possible may be considered desirable, but it's interesting that if you think about the situation and you read the scene, she seems, if anything, exceptionally reasonable and patient with Tommy. I'd think an actress might want to play her that way, but perhaps the audience should not be allowed to feel any sympathy for her. But, really, Lerner did not write her at all negatively, which is interesting.