I wouldn't go that far, Magill exposed far more corruption than the rest of the so-called Fourth Estate. Even in its revamped format it uncovered even more. I think Browne's failing was to overlook the demise of print media and serious magazines (though they would boom online).
Browne likes to provoke, I wouldn't confuse too much his fuelling debates with his actual politics. And whether or not you agree with his agenda, he has contributed to and uncovered more corruption than most of his pals.