I think what made me appreciate this film the most, and what sets it apart from The Force Awakens in particular (A film I absolutely love, must say), is that it truly caters to the older audience in the most beautiful way. It is not afraid of being morally ambiguous, violent, or straight up heart-crushing. That is incredibly refreshing to see in the Star Wars universe.
My greatest appreciation in the film goes to the simple fact that Jyn and Cassian did not kiss. They just held each other, and it made it all the more powerful.