First off, the weapons ARE used in more places than just the dungeon that you got them in. And they already tried a leveling system for Zelda and it just didn't feel right for the series.
If you're complaining about how Zelda isn't like one of those rpgs that have "rich story" and a "leveling...
The Wii motion plus will actually make the game HARDER. The way you slice depends on what happens. And for your information, that was a DEMO they hadn't completed the game then. It was to show what the game would feel like and the basic capabilities of the game. So don't get too stressed...