As far as past experience, I think Secretary of State and Senator from NY are both bigger than a lot of former Governors or business leaders who run. International diplomacy experience and national politics experience are both big pluses. What did she do in those positions? Tough to say but I can't think of another Senator from NY or Secretary of State that just blew my socks off either.
I know people that would vote for her because of the role they think Bill would play in administration, whether official or not. If your point is that she is the D frontrunner largely due to her husband, I don't know many that would argue with you. She is qualified regardless of her husband though.