I thought that weird JD Vance did better than I expected, even if almost his entire shtick consisted of three things: taking about himself and his family, blaming every possible problem on immigrants, and saying that we need to produce more energy.
Tim Walz is clearly not a good debater in that he sometimes spoke too fast and mixed up his words. He was at his best when he got passionate about a topic that he clearly cared about, such as child care, housing, health care, and reproductive rights.
All in all, it was a more even-tempered debate than the Harris-creepy Trump one.
There was no clear winner or loser.