I only watched the last 30 minutes, but it was fucking exhausting.
I'm sure that somebody like Warren or Sanders may have done marginally better (as birdman touched on, I think Biden's speech impediment made it more difficult for him to respond to some of the rapid-fire bullshit spewed by the President), but I'm not sure how much better anyone can do in a format where the other debater never shuts the fuck up.
I think Wallace and Biden were in the same spot; without the ability to backhand the President and tell him to shut his fucking mouth, I have no idea what else you can do in that situation.
Did Biden probably miss a couple lay-ups? Yes. But he also didn't go full screaming banshee, which probably would have been worse.
I think it was an intentional strategy to try and get the guy with a stutter frustrated and to start fumbling over his words. I don't know much about the psychology of speech impediments and how much it stays with you at 78, but that was an amazing performance by Biden even without the extra burden of a repressed stutter.