Kylian Mbappe was star performer of the night but you can't take away the fact that all members of the team played important roles in helping the club beat a strong European club like Manchester City.
Yes, he gave good evidence with 3 goals. Man City was destroyed with possession. Man City were ineffective so they lost. Losing and failing to qualify for the last 16. It seems that this is Pep's first bad record during his time with Man City by not qualifying for the knockout phase. Man City's defense is bad, I think Khusanof can run fast but he failed to compete with Vini and Mbaape. But the injury problems of Haaland and Stones seem to affect the team's condition. It seems that Madrid is a little lucky because Haaland and Stones are injured.
Both are the strongest clubs in the domestic league and the Champions League, so anything can happen in this match, but if you say that this is Pep's worst match, maybe not because several times he handled big clubs he also experienced failure, so this is just a matter of several core players who were injured which made Pep also unable to rely on players who he thought were still lacking to face Real Madrid's star players, we also know that with the players that Pep fielded were not comparable to the players that Real Madrid had that they were very complete overall and the tacticians that Real Madrid had were also experienced in the Champions League.