Well, this is a Zelda game. The formula has remained unchanged ever since The Ocarina of Time. The princess has been abducted and you must work your way through the various dungeons one-by-one, collecting a new power in every dungeon. Each game in the series introduces a new game-play element. In the case of Skyward Sword that is its (supposedly) precise motion controls.
Skyward Sword requires the use of the Wii MotionPlus controller. While it's definitely an improvement over other games that have tried to use the standard WiiMote as a sword, you still end up just flailing your arms like an idiot. The key here is to realize that the game is forgiving enough to allow you actually to take your time and be precise for many of the bigger battles.