Susan Rice may or may not be qualified to be Secretary of State or even secretary of the local school board. As far as I know the job is not open.
By all accounts John Mitchell was qualified to be Attorney General under Nixon. His qualifications did not make a difference when he lied and helped cover up a minor burglary. He went to jail.
No one died in the Watergate break-in.
We cannot lose sight that four Americans died in Libya, while the White House watched in real time and sent no aid. Susan Rice was the face and mouthpiece of the Administration who spread a false story to the American people. Maybe she knew the truth, maybe not. She still had a role in the cover-up, and it is not unreasonable to expect answers as to that role.
If you think this is much ado about nothing, how would you react if this mess had occurred during the hated GW Bush administration? Try opening your mind, it is a valuable exercise.