In fact, Real Madrid, which basically brought in great players like Mbappe and several other potential young players, in reality Real Madrid still failed to start this season perfectly. So, if a team like Real Madrid can also fail, especially a team like Atletico whose quality is basically below Real Madrid, then of course Atletico can also fail even though they managed to bring in great players in the last transfer market.
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In fact you need to understand that Real Madrid failed to start this season perfectly because they had to face a lot of injuries. If we consider, Real Madrid's crucial players like David Alaba, Dani Ceballos, Jude Bellingham, Eduardo Camavinga, J. Vallejo, F. Mendy, A. Tchouameni, and Eder Militao are injured and still are. So in fact this was the reason for Real Madrid's failure, when a crucial player is missing in the team, how will the team be able to perform, even if the team is using a player like Killyan Mbappe, the output result will be weak.
Therefore, when the comparison is made, Real Madrid has many player injuries, while Atletico Madrid had few players injured and now they have also recovered. Real Madrid did not perform due to lack of players whereas Atlatico Madrid did not perform due to lack of competence. It is inappropriate to compare both. Real Madrid is one of the greatest teams, despite Atletico Madrid being a normal club.