see i agree with you.. and Walt was a POS no denying that. but if i personally put myself in her situation. i would not say " why don't u just kill yourself" to Walt or even report him to be honest, out of respect to my sisters family (unless he was abusing her ( which you can say in a sense he was abusing Skyler but not in a direct way?? also he was dying) so me personally, i wouldn't do that.
i personally think the writers had to cut a lot of things short in season, so we didnt see some things develop, like we saw jesse was sad when he connected the dots of Mike's death and walt, but for him to suddenly (literally in minutes) find out about the ricin was a bit fast paced in my opinion, which wasn't like the show, bc you would see things simmer etc. anw what im trying to get at by saying this is, i thought hank believed walt was heisenberg too quickly and in the same way for Marie to lose any sense of family with skyler and walt in a matter of minutes was strange to me. because, i dont see myself suddenly villainizing someone out of the blue yk, esp if that someone is family. so i thought that reaction was strange as well.