Personally, I don't care about what he did. What made him famous wasn't his upstanding values, it was golf, and I'd like nothing more then to see him continue his life as a golfer.
That being said, I know what it's like when someone cheats on you, and that's why I'm not at all impressed with his sexual exploits. It was with another woman other then his wife, and it wasn't just simple talk, or even a one time affair. It was planned out, methodical, he took repeated steps to hide the affair because he knew it was wrong, it wasn't just a moment of passion (which in itself terrible, but maybe explainable).
From what I gathered from his texts is that he had some dom like tendancies. What he did, betraying the trust of his wife in such a vicious manner, defies what a dom should be, even a bedroom dom.