First: backfill on a doomed team, I came in as Widowmaker and made them competitive. We still lost, but they went from being steamrolled - apparently, the entire game, given how much time was remaining when I arrived and how close the enemy payload was to destination - to a serious goddamn problem. We held them nearly five minutes, despite being less than five metres from destination when I arrived. It took a large ult stack to beat us, too.
I've long been able to shift games like that for a while as Tracer or D.va or Pharah, but I'm pretty sure this is the first time I've managed that big of a swing as Widowmaker.
Second, towards the end, I had three games against the same enemy Widowmaker, username something like "animevslife" or somesuch, but it doesn't matter. What matters is that she was completely outclassed, by me. I was headshotting her at will, and had like five just of her in one game. (I was also carding a lot, and the only member of my team to card in the last game.)
It's not that they were a terrible team, or even that she was a terrible Widow - she was not entirely unproductive - but she had to stay the fuck away from me, because I would just end her on sight. I've been the better Widowmaker several times before, of course, but this was just not even close, and wonderful.