The Left: "Ha ha, the right has set the bar so low for Biden all he has to do is stay awake and he'll look great! The fools!"
Also The Left: "Trump is completely incapable of avoiding hostile insults and rambling, incoherent diatribes and will probably poop himself on stage."
The second debate between these exact two guys was only 4 years ago and Trump did "great" just by not insulting/interrupting nonstop. And the CNN rules for mic muting recreate that environment by force.