Yes, I think they played very well against Real Madrid. Especially the Juventus goalkeeper, he deserves the highest score. We have to realize that teams can't always be stable. Another condition is that it's the beginning of the season, I think the coach is experimenting a lot to find the best combination.
Against Man City yes they did perform badly, even if they should have played like when they met Real Madrid the results would have been different. I think this condition will make Juventus think a lot to improve the condition of the players. This is because the transfer season is also still open, so Juventus can still take advantage of it.
Honestly i still give Juventus a negative outlook, the reason is the lack of serious investments, the team is a half-assembled thing that i don't see working. In my opinion the lack of imaginative players, like Federico Chiesa, still weighs heavily, it was a mistake to have given him away.