Fetterman's delivery was rough given the auditory processing issues. The fracking question was probably his biggest policy stumble. He had a few good jabs against Oz.
Oz was talking really rapidly and smirking inappropriately. He had a bad abortion answer. He came off as super inauthentic. I don't see how he improved his terrible favorability.
I don't think debates matter that much unless they go really poorly or really well. And I don't think either candidate did super poorly or super well.