This has to be one of the best games I've ever played. Even playing it for the first time on GOG, it's fresh and new, and looks beautiful most of the time.
It is basically a 3d Zelda game. It's ocarina of time with better graphics, great voice acting, better combat, stealth sections, some decent platforming, some fun boat races, and cool & useful teammates.
I enjoyed the setting, the characters, the story, and most of all the world they created. The main character is a fresh one, and someone you can care about. the sidekicks are funny, not annoying, and can be used in creative teamwork ways (in puzzle solving and in combat).
I also totally loved the camera, and had almost as much fun taking pictures of animals as playing the game. What other game has you taking beautiful pictures of breaching whales?
If I was to say anything bad about it, it'd be that it's too short. The ending section passes very quickly, and doesn't have much of the exploration, collection and photo elements of the rest of the game. It also doesn't have quite the variation in environments that Ocarina has. And finally, on the PC, the camera can be annoying at times. (on foot is ok, but the boat is impossible to control in 3rd person. (press E).
Great game in almost every way.