Yes the not helping with the packing thing annoyed me too! And the fact that he went out to 'make some calls'- right yeah you just go out wandering while I sort stuff out, the fact I think you shagged the babysitter doesn't make me suspicious at all now! But then his wife has consistently not noticed that he's aloof monosyllabic and uninvolved.
But, it's a drama, they needed to get him out the house to make the call. Nearly all of these types of dramas have these types of holes as they need to move towards certain plot points. Glaring holes can really jar and spoil a show though.
I don't know any women like GA. i think she is meant to come across as an unusual women. An unusual person; with the degree of her self control, self containment, directness and lack of interest in others perceptions of her. They are just particularly unusual characteristics for women, and women in dramas.
This doesn't worry me though as I also didn't know any men like Cracker, Jack Bauer, or Don Draper. but I liked those shows too (to varying degrees).
I do think some of you should maybe stick to documentaries.
Feminist leaning documentaries written by women, about women like you and your friends, who all behave in a rational predictable manner.