From everything I've heard in articles/seen in videos, apart from the shameful demonstration due to wireless interference, Skyward Sword's controls
are very responsive,
very responsive. Miyamoto did a do-over later in a more secluded environment so he could show the game as he'd intended. I'll admit I was disappointed by Miyamoto's original showing, but everything that came later lifted my spirits about the game.
The floor demo, for instance, had no problems. I saw a video of some random guy at the press conference getting a whack at the demo and he seemed to have absolutely NO trouble whatsoever. Everything he did went off without a hitch. In fact, it was almost too seamless, as the Deku Baba didn't really seem to pose any threat when the controller was working properly.
http://kotaku.com/5564197/the-legend-of-zelda-skyward-sword-video-preview-starring-meIt's a shame we didn't get to see Skyward Sword as it was meant to be played at the actual conference, but there is every indication that their talk of wireless interference was
not BS or excuses but a legitimate problem. Everything I've seen of Skyward Swor'd gameplay since then has impressed me.