In January when Rex Tillerson was still the Secretary of State he gave a speech on U.S. policies in Syria at my school, and even though the majority of the audience strongly disagreed with what he said, we liked how he said it. He was very amiable and captivating, and it didn't come across as an act. He is indisputably intelligent (Trump's petulant claims to the contrary are without merit, and self-defeating even though he obviously fails to realize that), and I think he has some genuine decency in him, though I think it's fair to describe actions under his leadership both at Exxon and as Secretary of State as indecent.
I also got to see Betsy DeVos when another professor (not Dr. Rice) had her surprise our class with a visit. We're not allowed to give details of what we talked about, but can give our own opinions of the experience. We weren't nearly as impressed. She came across as a total dilettante. She extremely nice, but in a way more artificial manner. She smiled at the end of every statement, regardless as to whether that was appropriate in the context, and it seemed like that was a ploy to try to make her persona compensate for her ineptitude. I'm just an undergrad but the class was actually in the graduate business school, and a lot of the other students were well into adulthood with actual professional experience. But she lavished praise on us in a way that would be more befitting for an elementary school student working on an art project. Another person in the class described her as the type you'd want to nominate to be in charge of an annual high-society ball, the kind that purports to be for the purpose of fundraising for charity, but spends way more money on putting on the event than raising any funds to donate. She did not earn from us the respect that Tillerson did; she actually corroded any respect extended to her simply due to the position she is in.