^^Actually I'm inclined to agree with you. But in the discussion above the hints toward an evil Marilyn (who would have done this on purpose) were stretched to interpret Marilyn as a consistent character. I
thought she was not, partly because like you I thought she was supposed to have killed the scoutmaster by accident. I was phrasing things with this context in mind.
I think where we differ is that the hints about an evil Marilyn versus this scene (and Lily/Herman's discussion) of her, left Marilyn unfocused. For me, that meant dull, because it had no point. I think your real argument is with the people who thought Marilyn was the creepiest one of all and had conflict with Granpa (over what? not said, I think.)
As I say, there were good one-liners etc. but the whole thing was just kind of off-kilter, and it seemed that NBC made a good call, all things considered.