Well apart from the fact that you're judging the game based on two trailers, I'll give you s couple of reasons as to why you're being irrational.
You say that Nintendo hasn't revealed anything about the game's world, story, etc. Do you want another Final Fantasy XIII, God Of War 3 or just about any HD game's press attention? You know, where just about every boss, plot element, detail gets revealed and all that's left is to actually hold the controller? Even that's useless, though, since the media has already played the game for you. Imagine that kind of press for older games. Samus being a female, Aerith's death, and dozens of other twists and narrative elements that have gone down in game history as some of the most memorable events ever, would have been completely ruined and spoiled.
Also, Twilight Princess made us go "wow"? It looked like Ico and Shadow of the Colossus on PS2. The art direction in Twilight Princess is fantastic, but I don't see how it was some mind-blowing use of the GameCube's power. The PS2 had stuff like Snake Eater. Now that was amazing. And I'd like to add something to your "gameplay > graphics" statement: art direction > graphics. And: world > graphics.
As for repetitive "gameplay," well, what was so fresh about Twilight Princess's mechanics? The trailers just consisted of Link slashing enemies like in, gasp, every other Zelda game! Oh and which puzzles did we see in the trailers? Honestly, I can't remember any. Maybe it's because Nintendo is saving them for the actual game?
I agree, the visuals in Skyward Sword could look a lot better, but hey, we've only seen two trailers.