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Mentality is the main capital that Real Madrid brings to the Champions League, they have repeatedly been in situations where they will lose, but at the same time they have also managed to turn things around and they have become winners in the match, especially in the knockout round and also in the second leg. This is a very good thing that Real Madrid has, and I also agree that so far they are the best club when it comes to mentality in the match. Well, whoever will be their opponent must be careful, because the bad results they experienced before will not make them give up easily.
I agree with you, but there is one other thing that may be difficult to say about Real Madrid. In my opinion, Real Madrid is the most influential big team in Europe, I mean sometimes referees tend to make decisions that favor Real Madrid over their opponents and this is the part that is most difficult for most people to admit. Only those who are neutral will admit it, while others will likely deny it.
I know that referees are human beings who cannot fail to make mistakes, but sometimes their leadership in matches involving Real Madrid is very unfavorable for the opposing team. There are some decisions that can be controversial at times, these are the influences I mentioned earlier.