I just came back from seeing it, thought the special effects were great, thought the girl who played Lucy was marvelous, thought it dragged a little in places, but basically was a good adaptation of what is, after all, a YA or Juvenile fantasy (this is a genre I like, so calling it a YA isn't a put down in my book).
A good time. If there were more movies made like this (interesting, clean, with clearly defined right vs. wrong and heros), I would probably go to the movies more often.