While I doubt her viability as a presidential candidate, I've been very impressed with her questioning of not just Barr but other administration officials on a range of issues. Being a former prosecutor (San Francisco, CA?) has obviously taught her a lot on how to get to the crux of the matter and an honest answer, instead of just grandstanding to make a political point, like most of the other politicians on each side.
As a registered Independent I find it very frustrating to watch these blowhards, again on both sides of the political spectrum, just asking politically bent questions, instead of just getting to the truth about what happened.