Are you really surprised with that outcome yesterday? Despite that I didn't expect that much humiliation, I wasn't too surprised because Athletico Madrid always turn prime against Real Madrid. Well, I quite agree that Madrid haven't had a test yet this season until yesterday and unfortunately they failed the test. Let be realistic here, Madrid defense is nothing to write home about and this might just be the beginning of failure if things continue this way. As for Athletico Madrid, they can do better if they continue to play with the type of seriousness they use to play against Real madrid all the time.
The first reason is that Atletico Madrid were not in good form. They did not play well in the previous matches of La liga. We saw the weakness of Atletico madrid's attack.
Also, Real madrid won the first 6 matches. So naturally we considered Real Madrid as the favorite. Also , Real madrid's past record against Atletico Madrid was also very good.
But even then, Real madrid lost the match. The most shameful thing is that Real Madrid lost the match 5 - 2. It was unimaginable that we would see the giant team of La liga defeated by such a big margin.