Didn't read most of your post for fear of spoilers (haven't seen tonight's ep yet). The show started off so strong only to fall apart over recent eps, especially last week's. I saw a bit of your post about Rosie not being explored, and I agree. Initially that wasn't the case. We got to know her family, and more importantly her friends. The show hit a peak when it seemed like we were learning Rosie wasn't the saint everyone portrayed her as. Yet that arc was completely abandoned as every other plot got expanded: Bennett's wife/community, Holder's AA, more political figures, etc.
Rosie has completely been lost, especially as red herring after red herring further moves the plot away. I'll probably watch the episode tomorrow; I'd rather rewatch GoT, then continue my movie marathon. There was a time when I'd watch The Killing right after GoT, but that isn't the case anymore.