I watched most of the debate last night.
I thought Ham did quite well-- his strength was in showing the difference between observational/experimental science and historical science. YEC's do observational/experimental science just as atheists do.
If fact (I point out), atheists borrow Christian inferences (nature is rational, consistent, natural laws exist, things reliably have causes, etc). The atheist inference to "everything came from nothing" and "nothing needs to have an ultimate cause" is a science-killer, obviously. Atheists must borrow from Christians even to begin to do science.
Ham was also very strong in pointing out that historical science is predicated on worldview, atheist no less than Christian.
Ham was more vague on his evidence for a young earth. As I've noted many times, I think the earth is old.
Nye was not impressive, in my view. He walked right into Ham's trap by focusing almost entirely on historical science, which Ham had already distinguished from observational/experimental science and had pointed out that historical science is predicated on worldview.
The remarkable thing is that an experienced science communicator couldn't trounce a young earth creationist pastor. And of course, Nye's bizarre metaphysics-- everything came from nothing, nothing has a purpose, nature manifests no evidence for intelligent design-- wasn't even a topic of the debate. Only Ham's creation beliefs were on the chopping block.
Ham did very well. He dissected the weaknesses in the atheist/Darwinian conflation of historical science (which is predicated very much on worldview) and observational and experimental science, which is much less dependent on worldview and in fact is done more effectively by inferring design and purpose in nature. Nye pointed to some facts of historical science (with which I mostly agree) but he was unimpressive and unfocused, despite the fact that he had a massive science establishment in his corner.
You get a clear sense from watching the debate why Darwinists don't want Darwin's creation myth questioned in schools, and why they go to court to censor any questions. The Darwinian creation myth won't even withstand the scrutiny of schoolchildren.
Atheists and Darwinists run like cowards from debates.