I don’t see it as a “bad” performance at all. He has the deck stacked against him, and he held his ground. He did not provide any major gaffe, nor a useful soundbite that can be used against him.
Clinton needed a knockout win to stop her obvious slide to oblivion. That did not happen, no matter how hard the MSM tries to portray it as such.
I think he could have done better, but could have done much worse.
This photo evidences such....