Incredible storytelling, first in the timeline, a real Zelda in danger and a goddess warrior were some of the points that makes Skyward Sword one of the best in the series. In fact, it's the best one since the mythic Ocarina of Time.
Flooded by puzzles in and outside from the traditional dungeons, Skyward Sword defys the conventional puzzles that games like The Wind Waker and Twilight Princess had and feels like a dumbed version from their predecessors.
Despite Majora's Mask almost perfection, Skyward Sword adds a new interesting chapter to the story, unlike the mentioned Majora's Mask which was more like a spin-off.
Controls. Perfect. Use of Motion Plus was justified every time you had to balance on a rope or slash your sword. Graphically it was one of the best on the Wii and artistically a perfect mix from past entries.
A good villian like Ghirahim, a cruel Impa and epic boss fights make this game the best since Ocarina of Time.