Twilight Princess proves that the old saying "Don't fix what ain't broken" isn't a bunch of rotten cheese.
The story is similar to that of previous Zelda titles. Travel around the land of Hyrule, defeat all of the temple bosses, defeat Ganondorf, and rescue the princess. Your new partner, Midna, also plays a significant role in the game. There's also a new villan: Zant. As you progress through the game, you will notice the story get deeper and deeper until the end.
The gameplay has changed somewhat from Wind Waker's. There's no sailing or "wind waking" involved. Instead, you get to play as the new Wolf Link (Okami, anyone?). When you reach an area covered in Twilight, you must turn into your newly-acquired Wolf Form. Outside of Twilight though, you must defeat enemies and conquer temples in your human form. To attack, you simply swing the Wii Remote and Nunchuck in your hand, though sometimes controls can be unresponsive or Link can attack when you don't want him to.
Surprisingly enough, the graphics engine is the same exact engine used on Wind Waker, with a few polishes. On the Wii, the graphics are nothing the Wii can't handle. The games graphics were meant to bring out as much graphical power possible from the Gamecube. The Wii version is also a mirrored version of the Gamecube one, with Link's sword being in his right hand instead of his left. Though the graphics look pretty, there's a few rugged textures here and there, but most of the graphics are clear and impressive.
If you're a Wii or Gamecube owner desperate for a good game that will last you a long time, then look no further than Twilight Princess. It's probably the best Gamecube game out there, and one of the best Wii games, too. You definitely don't want to miss out on this masterpiece.