I enjoy watching Bob McDonald. However, although he's very good at putting things in layman's terms, he's not
inspirational.
Carl Sagan's voice is a treasure. I like Bill Nye, as much as I've heard of him; I didn't get to watch his show as a child so for me he's just a passionate guy on science/critical thinking podcasts. Tyson is a gifted science entertainer, though his podcast and videos are better than his book. Attenborough's work, of course commendable, is more nature-based than about the practice of science. On my experience, Sagan is far away the best; he had the advantage of working with space probes, he had the national wonder that was
Cosmos, he penned well-crafted and engaging books, he was constantly being interviewed by the press and of course he had That Voice. Isaac Asimov probably did more than anyone on the list for layman's science education in the 20th century, but when it comes to getting The Masses interested, let alone excited about, science, I don't know that he could make the claim. TV excites the rabble more easily than books do.
I remember a few days after seeing Cosmos for the first time, I went shopping at one of the bookstores in town (as part of my usual weekly hunt for new Star Trek and other science fiction books). I mentioned to the owner that I'd seen Cosmos. Immediately he asked, "What did you think of his (Sagan's) voice?"
I said I found it very pleasing. The store owner said he did too, but that his wife couldn't stand it. So there was at least one person on this planet who didn't like Carl Sagan's voice. I guess it takes all kinds to make the world.
I would classify Isaac Asimov as a science popularizer, but of course he did it with books instead of on TV. Asimov's speaking voice wasn't all that nice to listen to (from my perspective he had a rather unpleasant accent) but I loved his science essays. Even in junior high I would read his science essays for fun - in my spare time at school, where the other kids couldn't understand why I would read a science book if it wasn't for homework - and at bedtime. I still remember the essay about the Moon/Sun and eclipses, the Moon's orbit, and how weird it was going to get in the future. Asimov really had his readers going with that essay... right until the end, when he said, this is really theoretical, because by the time this would happen, Earth and the Moon won't exist anymore.
And before people dismiss Asimov as a mere writer more known for science fiction than science, I will remind everyone that Asimov
was a scientist. He had a doctorate in chemistry, he did research, wrote many articles and science books not intended for the popular audiences, and he taught university students.
Why not an actual expert in geology, instead of someone who taught undergraduate students and enjoys watching himself on TV?
Is there some reason you keep sneering at anyone who teaches/taught undergrad students?
Somebody has to teach them, and why not an instructor who knows his material
and can inspire his students? That's not a combination that comes along every day.