Not Quite as good as Ocarina, but REALLY REALLY close.
Audio: Incredible. Jeff complains about the midi songs. Im VERY pro-midi. I dont mind the big orchestrated sounds, or the synth or whatever. But midi just has a certain feeling. Im glad they stuck with it.
Controls, pretty well on gamecube. Some issues. Nothing major really.
Difficulty: Fairly hard. Boss battles are easy. the real meat is just in the adventure. The dungeons are way cooler than in Ocarina (Exluding the forest, spirit and water temple but theyre definately on par with these)