Don't you all get it? There is no "rightful king." The only defensible society is the democratically elected Wildlings or perhaps the Night's Watch. You don't derive supreme power from some aquatic tart.
Agreed. Martin pretty much skewers the whole concept of royalty and birthright in his novels. Any monarchy is only as good as the man who happens to be sitting his arse on the throne at any given time. The realm might luck out with a Baelor The Blessed or get fucked over with a Joffrey or Aerys II. Stannis is one of my personal favorites, but he would have made a terrible king in that he is far more concerned with his own personal honor, glory, and respect than the common good of the realm. Great general, lousy ruler ala President Ulysses S. Grant.
Oh yeah, back to the subject of the thread. I thought I remember reading in one of the novels that Tywin and Stannis, unlike the reckless Robert Baratheon, tend to lead from the back of the line vs. charging into the fray. So, while it was pretty badass to see Stannis scramble up the ladder and lop off some heads, it does seem to contradict his book persona.