To be honest, I can't understand why you would be disappointed with Real Madrid's performance today, because as a Real Madrid fan, I haven't seen Real Madrid playing well in the last 4 years. They have been playing with the clear objective of just winning games. It doesn't matter if they score a lot of goals or if they play well. As long as they win, everything is fine. This has been the Real Madrid coach's attitude since he arrived at the club. While Barcelona has been very concerned about playing well.
I assume you aren't a true fan of Real Madrid, so you can't feel the disappointment. Instead you give praise to Barcelona game. 
Dude, it is not only about winning the match but it is also about the way to win it. Even if Real Madrid won the match today, they played rather badly. They were lucky that they scored one goal because they only played with 10 players since minute 39'. It was too bad that Mbappe got a red card.
Real Madrid has dropped much on their performance in the last few matches (both in domestic competition and in UCL). I think Ancelotti has a problem with his tactics, he needs to change the tactics a bit. There is also a problem of Real Madrid players' mentality. They seem no longer playing like in the past, nowadays they can't show playing as a solid team. Some players looked to play under performance as well. This is a serious problem for Real Madrid, Ancelotti must be aware with this problem.