I would agree that the story was originally somewhat darker, but the original movie was such a great thing... it just doesn't need a re-interpretation.
I like Tim Burton, though he's a little on the dark side.
But Depp? Aw, man... no way.
I thought the rooster getting it's head chopped off when they were in the boat was scary enough! LOL!
I don't remember the book as being dark.... I read it as a little kid.
I'm beat... going to bed :~D