Hysteria holds up in the sense that it is just as awful as it ever was.
Honestly I think the older Def Leppard material like On Through The Night is less dated because it is not half as slick and obviously 80s hair era, and thus more likely to appeal to a new listener these days.
I think Def Leppard really hit their peak around the second half of the song "Let It Go". By the time Pyromania
came along, everything was already sounding like "product".