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Yes Madrid dominated match but they could not create good goal chances. Without penalty they would face even more frustrating goalless draw as you said. This demonstrates typical difficulty at best teams to crack defensive opponent. You are also correct that single game does not give whole picture and therefore because of that true test for Real Madrid will be to determine whether or not they will be able to exhibit greater ability to create scoring opportunities in their future matches to convert their domination into goals.
One of the things that is considered during a game is goals and not even domination, because Madrid was dominating the game and could not even win, and that is no good at all, so this is why I feel like Madrid did not do well, because the only thing that made them win that match was the fact that the penalty was the only thing that made them win that game, so if not for that, then. And I wonder what must have happened to Madrid to have found themselves at this point, because who would have imagined that? And I think people need to understand that not all clubs are perfect, but Madrid needs to warm up and wake up because the fan base is not happy. After all, who would have expected to see Madrid struggling to win games, and the season is just starting?