The debate played out pretty much as I expected.
Joe Biden tried to give wonky answers to policy questions while serial sex abuser and convicted felon Donald Trump (SSACFT) lied and lied repeatedly and avoided answering questions, pivoting almost immediately to complaining about the borders, and how everything was great when he was president and has gone to hell under Biden. It was basically the stuff that he says at his rallies.
His shtick was to largely claim that the US is weak and despised around the world because Biden has allowed open borders that allow millions of criminals and insane people into the country who are murdering people. He kept saying that over and over again. The moderators did not do any fact checking at all. The only thing they did was to repeat the question when SSACFT did not answer but then SSACFT would largely ignore it again.
While Biden tried to combat this with data, his presentation was not forceful enough.
On the optics, Biden seemed hesitant and soft-spoken and stumbled occasionally, while SSACFT portrayed confidence even as he flat-out lied. And in the US, since optics tends to win over substance, Biden would not have inspired his supporters with confidence.