No real answers or policy proposals, blaming every problem on migrants (while Biden's policy on the border is largely a continuation of Trump's), just a bunch of bullshit "everything was great, now everything sucks, but I will make it great again". I honestly cringed at Trump more, Biden's ramblings at least were funny.
I can't imagine anyone who's undecided at this point listen to this and say "This guy will make things right". Trump's entire objective is to let Biden stumble and fall and then cruise to presidency, but he makes every effort imaginable to prevent himself from it. No zingers or clever retorts against a literal corpse (aside from maybe one "I don't know what he said and he isn't either"), just and abysmal performance. Honestly, even someone like Ramaswami would've dogwalked Biden.
If anyone is capable of losing to Biden at this point, it's Trump.
The worst thing that Trump said during the debate was in the brief period when they were talking about Israel. Trump says that Biden should let Israel "finish the job" in Gaza. Trump said that Biden is a Palestinian. Trump uses the label Palestinian as a derogatory word.
Biden says Hamas is the only group preventing peace after describing a deal Hamas agreed to and Israel rejected
Trump calls out that actually Israel is the one preventing peace
“And they’re right to do so and should finish the job”
We knew this, right? There's a reason that Bibi has back stabbed Biden and is now begging for Trump - it's because Trump wants Palestinian children bombed more than Biden does, and he'll make more of it happen.
Also during Trump's presidency he did many things which hurt Palestinians and helped Israel, such as the Abraham Accords and moving the US embassy from Tel Aviv to Jerusalem. He also cut funding to Palestinian aid groups, stopped funding to UNRWA. There's also speculation that his assassination of Qassem Soleimani was on behalf of Israel.