Rosalina appeals to a new generation of Mario fans. Younger fans are more likely to recognize her than say Daisy because Mario Galaxy was one of the first Mario games they played. Not everyone can start with Super Mario Bros. or SMW or Mario 64...
Personally I found Twilight Princess's ending more emotional than Skyward Sword.
Idk about that
Storytelling pretty much went out the window after COD4 in the Modern Warfare Trilogy