You are right. I always want big teams to play very well and dominate and win. But it is not always possible. But no matter how the teams perform, the most important thing is to secure 3 points at the end of the day and that is their main goal. Barcelona cannot say that they played very well, but they were able to secure three points from this match.
Rayo Vallecano is in good form at the moment. It is very difficult to win a match by dominating against this team. Real Madrid is also going to face Rayo Vallecano in the second week of March. And it is expected that this match will also be very competitive. Even though the match is a home match for Madrid, it is unlikely that they will easily defeat Rayo.
Big teams always get obstacles when they face low-ranked teams so we often see them lose points in vain. However, it does not mean that weak teams can provide surprises but at the same time their opponents underestimate them so that it will be a mistake that they should not have done. Often coaches change their strategy when facing weak teams and maybe that is one of the unintentional factors that can result in losing points.
Indeed, this season the competition at the top of the standings is so fierce because the three teams at the top of the standings are strong teams such as Barcelona, Real Madrid and Atletico Madrid. So the competition between these three teams seems like it will last a long time until the competition ends because all three have a fairly close point difference. Bilbao also has the opportunity to enter the championship title race because they are only 6 points behind and they can catch up if the top team loses points again in the upcoming matches.