Real Madrid really deserved the victory, because they didn't allowed Barcelona to score a single goal from the match to prove to people that the injuries some of their players had some months ago that affected some of their potential players not to performed well that gave Barcelona to defeated them 2-1 in the first leg. Real Madrid were able to used all their potential players to played the second leg to defeated Barcelona 4-0 which is a sign that Real Madrid may have something reasonable to achieve in this tournament. Barcelona performance was very poor in this second leg which their coach need to apply some skills that will improve their performance in their remaining matches.
It's quite true. That was a bad performance for FCB. Apart from any other fact, it will be a big blow for Real Madrid if they allow Barcelona to record another win against them this season d they eserves this winning more because they haven't been happy after playing Barca for their past 3 clashes. But I will say this winning is more possible for Madrid because Barcelona also went through the same injury challenge that they (Madrid)did in the first leg. With Frenkie Dejong, Usman Dembele, Pedri, and Christensen all out, one will not expect the best of FCB. Though I wasn't expecting Barca to be this poor.