That is the biggest issue when teams or clubs decide to buy players because of their name and not because of their quality and type of game and how it fits into the team. That was one of the problems PSG was fighting with for a very long time when the most important attribute was a high price and a big name. But then they had these three players namely Mbappe, Neymar and Messi and while it was fun to watch them play sometimes, you could see that they were not the perfect combination of players to play against more carefully chosen squads.
And there are players that have both the name and the quality. And as for Vinícius and Mbappé, they are top-notch players, but sometimes the circumstances have a way of affecting good players, and when you have few quality players, it will affect the performance of the club, and you don't seem to like Madrid, or you have a personal beef with Vinícius and Mbappé because for some time now they have been unstable, but that does not mean that they are not good and this is why we are expecting Madrid to work on their defense. at least that will help their performance this season.
And there is no way that the price of a quality player will be cheap, so I know that there are players that are expensive and useless at the same time, and the truth is that every player has their time to shine. Even Messi is literally struggling, and it seems not to be okay for him. ronaldo is even better, so everyone has their season, but Mbappe still has a lot installed. He just needs time to adjust, because when they don't adjust, then is goal of winning the Champions League will be lost.