Yesterday's match is not and should not be considered as a measure of quality of the team. Juventus has just started their pre-season training and one part of their team hasn't even returned from their holidays yet. They have a lot of work in front of them. Nurnberg is the exact opposite. They have finished their preparations, and their season in the 2. Bundesliga begins next weekend. It's only normal that they will have much better match fitness. Juve played the match with many youngsters, some of which won't stay at the club and others who will feature for the youth teams.
Although pre season friendlies are actually a way to tell how the season will look but that’s not the best thing to use to measure the club going to the season. Some of the clubs are currently without their senior players due to the Euro and Copa America vacations, but the main thing is managers like Thiago Motta are implementing new tactics which will definitely not click in the first moment. Also most of all this smaller clubs take pre season more important because some players are seeking for top flight recognition not more. It will be absurd to rate clubs pre season performance in correlation to what will happen during the season, Pep hardly wins pre season matches