I'm going to sum up this video with this: Hillary Clinton sometimes sounds like nobody. And when she sounds like nobody from nowhere, she veers into that weird place where she starts sounding like a robot (think maybe a slightly more pleasant-sounding Siri or maybe even Google assistant). It's just slightly less human than most and apparently it irks a lot of people.
Whether you agree or disagree with her policies, you have to admit that this video was pretty interesting. I'd love for The Atlantic to do this to all of the candidates.