Definitely at risk of fanboying here, because I trashed Fallout 4 on release because of bugs (TBF that included NPC's disappearing in the opening scenes, and some really ropey graphics, including cardboard cut out 2d flat trees)... but I seem to remember reading The Witcher III was struggling around 20fps on Xbox One S. People still played it and loved it.
I'm a little surprised by the performance issues on PC, but I usually reckon on a bit of tweaking to get most things working right. Some people who've really struggled are fixing problems by reinstalling the new Nvidia driver twice or three times (it's always best to use
DDU). Leaving cascading shadows enabled apparently causes a very big performance hit. I don't really know what people expected, but it's not a twitchy shooter, and with adaptive sync monitors anything that stays above 45fps is usually not that different from the magic solid 60fps of old.
Still, I'm definitely tempted for at least one more driver release and patch.