Board Thread:Naruto Discussions/@comment-24373005-20140831023026/@comment-2120712-20140904145221

He gave up on world building and he eventually gave up on fleshing out characters. We know little of Kaguya's motives for hording chakra and creating zetsu's out of everyone else. Contrast that with Nagato where we see multi-level plans(the goal he let everyone else know and then there was his true plans) and back story to see what drives him (that included world building as we got to see what those stuck in geographically and politically deadlock nations face somewhat).