10.
I've written about it before, so I'll just do a short explanation. It has the best fighting mechanisms I've ever seen in a game, and the best controls. It also has some of the most clever and brilliant visuals in the game. There are very few games in which I've repeatedly stopped and just looked around thinking "Wow, this is absolutely gorgeous". The only ones are probably Ocarina of Time, Half-Life 2, Super Mario Galaxy, Portal 2 and Skyward Sword. Out of those, I dare say that Skyward Sword was possibly the one I enjoyed the most visually and atmospherically.
Additionally, it had stunning music. It's nowhere near the musical match of Ocarina of Time or Super Mario Galaxy, but it's still brilliant. Several of its pieces are on the list of music I can listen to when I'm down and it'll bring me right up again.
Finally, I really loved the characters and and story. The story itself is nice, but not amazing. The characters, however, are downright brilliant. Link himself is incredibly cute, and slightly helpless, to the extent that it makes for great humour. Zelda is, especially at the start, possibly my favourite female character in a video game yet. Groose is also fantastic, and pretty much the entire cast is memorable in one way or another.
Overall, best gameplay yet, top notch music, great story, fantastic characters and downright amazing visuals and atmosphere. It doesn't get much better than that. Probably my second favourite game of all time, and definitely in the top 5.
