Hillary Clinton is a bad politician. Ironically, her awfulness as a politician is why people think she is so great. Her political moves are so obvious that everybody discusses how "political" she is. "Oooooh, she is so Machiavellian!" Pundits are in awe of how overtly political she is--and they assume that her overtness is a sign of her excellence. Far from it. As anybody who has read "The Prince" knows, the true Machiavellian is one everybody thinks is a saint.
Or, to quote Kaiser Soze, "The greatest trick the devil pulled was convincing the world he didn't exist." Hillary is no political devil precisely because everybody is convinced that she is.