I am generally suspicious of games that people say are "better with friends," simply because most things are. Wolfenstein: Youngblood isn't really just better with friends; it requires them. That's not a ding against Youngblood. The game has always been positioned as a cooperative experience. It's a co-op shooter. To criticize it for not being something other than that is unreasonable.
Set in Nazi-occupied Paris in the 80s, Wolfenstein: Youngblood is a spin-off from the original story tasking twin sisters Jess and Soph with tracking down their father, BJ Blazkowicz, who has recently gone missing.
Trapped in a vegetative state for 14 years, Wolfenstein hero B.J. Blazkowicz awakens to a 1960 dominated by Nazis and a life no-longer solely defined by the killing of them. Not that killing Nazis isn't an important aspect of Wolfenstein: The New Order. What does a man driven by singular purpose do when that purpose is stripped away?