Mate, Real Madrid have already dominated the Champions League so far. 
They have a total of 14 championships achieved in this competition. Their success in the Champions League has become like an ecole.
Aside from that they won the title in the 2021/2022 season without having a player like Mbappe. Manchester City were still strong those times but Real Madrid still eliminated them in the semi finals. Maybe you will say Manchester City didn't have Haaland then. In that case I would like to remind you of another fact that Haaland didn't have much impact on his team's matches in the semi finals and final last season either.
By the way I can agree with you on a point. When Mbappe joins Real Madrid they will probably start playing at a much higher level.
They have a total of 14 championships achieved in this competition. Their success in the Champions League has become like an ecole.Aside from that they won the title in the 2021/2022 season without having a player like Mbappe. Manchester City were still strong those times but Real Madrid still eliminated them in the semi finals. Maybe you will say Manchester City didn't have Haaland then. In that case I would like to remind you of another fact that Haaland didn't have much impact on his team's matches in the semi finals and final last season either.
By the way I can agree with you on a point. When Mbappe joins Real Madrid they will probably start playing at a much higher level.
precisely, Real Madrid has a big big experience of the Champions League and also its coach, Carlo Ancellotti has gained a lot of experience in this competition with Milan AC, by combining these two entities a crazy mix comes out, they are very strong, nothing to say about it