Real Madrid signing of Mbappe from PSG was big surprise. Many top players want to join Real Madrid because of their reputation and influence. Although Madrid has made some expensive mistakes in past they did great job this time. Having strong team is not easy even with a lot of money. Barcelona and Atletico are also trying to improve their teams but Atletico is spending most money this transfer window. Barcelona ca not afford to buy all players their coach wants because of financial problems. Having good team does not guarantee success as we saw with Girona last season. Strong team is important but it is not the only factor.
It was a surprise to the entire football world that Mbappe joined Real Madrid from PSG without a transfer fee. Every football club wants to buy good strikers and defenders in the squad during the transfer window. A striker of such high profile who has left his old club without a transfer I would say is an incredible achievement for Real Madrid. Moreover, before Mbappé joined Real Madrid, they were very good and even won several trophies last season. But since Mbappe joined their squad has become much stronger even their attacking division has become much stronger.