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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.
In as much as they won the game bro truth be told that was a very disappointing result, like I wasn't just expecting one goal from Real Madrid in that match, they have really spent enough funds in this transfer window to have got such poor performance, hmm I'm beginning to doubt if they can really do something this season, yes we can't judge with just a game, but at least it won't be wrong if they start the first game with a very good and impressive result, if they continue like this am afraid Barcelona will still have it this season, and again they I think they should consider the UCL too if they really want to go far they should better fix what may be the problem.