First, anyone giving this miniseries a low rating and calling Connie Britton's character "dumb" or "stupid" has obviously never been in or been close to anyone in an emotionally/physically/psychologically abusive relationship. If they had, they would understand that, unfortunately, situations like this do happen, and much more frequently than would be expected. They also would understand how difficult it can be to extract yourself from abusive relationships, even if the abused realizes how bad the relationship/situation is. While I read the published story, I have not heard the podcast, which is supposed to be fantastic. The tv show is pretty faithful to the published story, although some of the characters (primarily her two daughters) are a little exaggerated for tv purposes. While I, like most viewers, feel frustrated with Connie Britton's character due to her repeated poor choices, I easily can see that she is a very sweet, giving, compassionate person who is naive and too trusting of others due to the way she was raised and her own honesty - she simply can't fathom that anyone could be so malicious and dishonest because it isn't in her character makeup. If you've been "around" in the real world at all, you'll quickly realize that most people highly suspicious of others tend to disbelieve so easily due to their own tendency towards dishonesty and deception, as well as low self esteem.
After saying all of that, we (my husband and I) find this show very entertaining and extremely well done. Both Eric Bana and Connie Britton are excellent in their portrayals of their characters, and I would figuratively "kill" to have Connie's character decorate our house - she has exceptional (decorating) taste!