In fact, as strong as we think Real Madrid is, it is based on the performance of the entire La Liga. But we have to see that they only do well against weaker teams. How strong Real Madrid is will be understood when they can defeat teams like Chelsea, Manchester City, Liverpool.
The team you have mentioned has never been problem to real madrid. I disagree with you if you say real madrid against weaker team. In laliga teams like Barcelona, Atletico Madrid are strong but Real Madrid are better in performance. If you think real madrid is not capable to defeat teams like Chelsea, Manchester City and Liverpool it wouldn't have been possible for them to win Champions league last season. Real Madrid are still in their best form.
I am sure that he is one of the people who said that the Real Madrid Champion in the previous UCL was because of the luck
Whatever the result, actually Real Madrid is one of the strong and consistent cubs in the Champions league. They also have a champion mentality. However, this season may be tough enough, Man City and Bayern are also very strong this season, and others are also the same like PSG and Napoli. Moreover, Benzema has several times in injury. This may be one of the matters and obstacles that Real Madrid has. But, I am sure that Real Madrid still can do their best with the whole entire squad in the team, with their solidity and teamwork under their great coach, Ancelotti who commonly has surprising tactics on the field.
Btw, Athletic Club lost to Girona, right? What's the matter with this club
They really lost their chance to make closer approaches to Real Sociedad and will be probably taken over by Ossasuna if this club wins.