Big teams like Barcelona ares such that you cannot count on their poor performance because they are definitely going to bounce back in time and improve their performance, Rayo and Atletico were possibly just lucky and so we cannot count that on Barcelona as been weak and not having been able to start of very smoothly but I believe they are definitely going to do much more better far into the new season and do not be surprise when they end up winning the league title this season.
Barcelona dropping points against weaker teams is not new. We have seen this many times in the past. Even in the previous season, Barcelona dropped points against weaker teams in several matches. On the other hand, we have seen Barcelona perform well against teams like Real Madrid, Atletico and Sociedad. Barcelona failed to win against Rayo Vallecano. There is no denying that Rayo's performance was incredible. They definitely earned points in this match. At the same time, I would like to say that if Hansi Flick wants to dominate La Liga, then every match will have to be considered very seriously. If he cannot continue his winning streak, it will not be possible for Barcelona to dominate La Liga.