Doesn't really feel like a Zelda game.
First, there's no plot. Yes, Tetra gets kidnapped and Link embarks on a vaguely defined adventure to rescue her. On his way, Link travels through many dungeons collecting several magical objects. Not only does it sound horribly familiar, it's also very dull. After all these years, the plot has seen no change whatsoever. Link is still a mute and the story never really picks up.
However, Zelda has never really been about the plot, and most people play it for the gameplay itself. The significant change here is the control scheme. The game is fully controlled through the touch screen; every action requires a pattern input such as tapping, drawing circles, rubbing, etc, etc. You're left with what feels like a very buggy, frustrating interface. If you want Link to pick up an item, you tap it, simple. However, Link may choose to attack it for whatever reason. It just feels very gimmicky and seems a good excuse to remove many of the essentials that made the older Zelda games so great.
Even with the shoddy touch controls, some of it does help. For example, throwing a boomerang or using a rope is more accurate than ever, usually requiring you to draw a line accross the screen in the desired direction. However, it's not enough to compensate for the overall poor feel.
The game has defenitely been dumbed down, and this is sure to dissapoint proper Zelda fans. It overloads you with a bunch of boring, repetitive tasks which you must complete to progress within the game. Take sailing for example. It was boring in Wind Waker and it's boring here. You draw a route, and your boat will follow it...very slowly. You sit there, occasionaly tapping on a pop-up enemy to fire your cannon at it. It dies, and after repeating that for a good 10 minutes, you've reached your destination.
You start scouting the island for clues, occasionaly making conversation with the locals to progress. Wait- Islands? Locals? What happened there? You enter a dungeon, grab the map, and embark on another snorefest of a sailing trip to another island. Repeat until you've completed the game, which without the long sailing sequences may take you about 5 hours to complete.
There are many little additions such as stealth elements in some stages and some touch screen or microphone requirements, but none of it really adds to the experience and it only feels like a showcase for what the DS can do.
Zelda games were meant to be played like Zelda games. In changing a much loved formula and keeping a tired, overused plot, Nintendo haven't done much good to formulate a true handheld Zelda experience.