The story wasn't bad, just somewhat predictable - I do think it could have been written to make me feel for the characters more, by keeping it more personal and making it less of a "epic chronicles of war" that the second half becomes.
The 3D effect was impressive, but the relative dimness and blurriness made me wonder whether I should go see it again as a 2D movie to see if I can get even more enjoyment out of the visuals apart from the 3D experience.
One tip, the movie is long and has so much eye candy it can be demanding on your senses, to get your money's worth make sure to see this when you're wide awake and well-fed - going to a very late night showing might be somewhat of a waste.