Thats because you're reading it that way and you have an axe to grind. Hillary has unequivocally earned what she achieved, but to say that she hasn't had somewhat of a boost because of her husband, in addition to her sincere efforts? Let's not be naive.
But it's never used the other way.
I never hear how much does Bill own from his career to Hillary.
How much did the very active, involved and political approach of Hillary helped Bill? She was a very popular first lady and she was very involved in the political process. That was the reason the republicans disliked her from the very beginning.
How much did the approach of Hillary to the scandal helped Bill too? A messy divorce a la Francois Hollande would have made a bigger and severe dent in Bill's popularity. Please see current case of Hollande if you want to measure what cheating and divorcing your wife while being president does to you. That case was messy with back and forth vitriol. He is being a walking dead man since, because you know women vote in bigger numbers than men, and that gap is widening.
When people talk about Bill, it's his career, his own legacy. 100% him.
When people talk about Senator Clinton, SoS Clinton, it's always the 'Clintons' as a couple. She is Bill's legacy.
It seems that successful men are always self made men, and successful women always own their careers to their dad, husband or prominent male in the family.