Great of a game that SS was, I've gotta agree with everyone; not to diss the OPs opinion or anythin'.
The Sky was bloody empty... All I did in the Sky was Skyloft junk, getting goddess chest loot, and taking that annoying trip to and fro the thundercloud more times than I'd like. Wind Waker's ocean of water had more to explore than Skyward Sword's ocean of clouds.
Fighting the Imprisoned three times was... annoying. By the time I was doing boss rush, I didn't want to slash another toe or smash another sealing spike ever again. Though, I have no qualms with fighting Ghirahim thrice; fun fight, and plenty relevant to the story. Though, he really should of been more difficult in the final fight...
Speaking of which, the game was way too easy. A game doesn't need to be difficult to be awesome, but even with Hero mode, I breezed through relatively easily. Ninty claimed it was the "hardest Zelda game yet" in the commercial, though... And thanks to Hero mode, I suppose that is true. I guess I'd say that the bosses needed moar difficulty, both in Hero mode and in Normal mode. Like how Shadow of the Colossus' Hard mode worked; not only were the bosses more healthy, but you had to do something(s) extra to off 'em in round 2. Bosses only did more damage in Hero mode, their patterns didn't change, and they didn't get new moves... This is probably the stupidest thing I'm bitching 'bout though lol.
ALSO, your last two hearts were from life metals. I have serious beef with this, since I had EVERY heart piece besides one (the rickety coaster minigame one; didn't even know the minigame existed until a friend mentioned it) by the time I finished Hero mode. If there were another eight heart pieces instead of two life medals, that'd get another hour of (most likely fun) gameplay. It was a tad lazy of 'em IMO.
Perhaps I just have high hopes and overly strong critique for the game celebrating a series' 25th anniversary, I suppose... No game can be free of problems after all. SS was still an epic game.