its more of a "i get knocked down, but i get up again" celebration. Deserving or undeserving its fair to say serie A is nothing without us. Its more of a moral victory for us over those who unjustly knocked us down. Its way of telling them, we are Juve.
Lets not also forget how hard the anti juve tried in putting us down into serie C.. so yes its worth celebrating as next year who knows we will be celebrating again and this time as champions of serie A. Never say never.. forza Juve!
Also I forgot to add we shouldnt go wild and crazy over this as celebrating it like a parade would make us look a "lil foolish" but rather its a humble, emotional and happy moment for us let us rejoyce.