It's not, actually. But think of it this way: the game itself is so beautiful that the developers didn't want you to spend all the extra time you would have spent reading the manual playing the game instead.
If you get it at Gamestop, just ask if they have any of the preorder bonus wallscrolls left. That's like a color manual x1000! All the artwork, none of those pesky instructions, and the whole thing is about six feet long.