I love this story. The special effects are so overwhelming that they're causing people to be sick. Not since "The Exorcist" have we had such fun with queasiness in the movie theaters.
With everything having to go bigger and better, there comes a day when a director needs to say, enough and rely on the story. The Hobbit has done okay for itself throughout history.
I'll warn my sons, but something tells me this will only increase their desire to see it.