I found the debate carried live on one of the minor cable channels. Fetterman's performance was really bad, but maybe not quite as bad as some people were expecting. He had some talking points that had been drilled into him which he mostly remembered, but at other times it was obvious that he was struggling to verbalize his responses which were sometimes very confused.
The moderators mostly did OK, but they spent a disproportionate time on abortion, which is somewhere between 6th and 19th place in voter issue importance surveys. (Oz was mostly pro life, Fetterman was not.)
Both candidates could have handled a question about Social Security better, but Oz was coherent and Fetterman . . . not so much.
Some critics said Oz was talking fast in order to make it hard on the closed captioning people - the big meanie wasn't trying to make his opponent look good.
Bottom line - aside from policy differences (which favor Oz), Fetterman - even with the crutch of closed captioning - does not appear to have the cognitive abilities we hope to see in our leaders. (Point fingers at Brandon, Feinstein, et.al.)