For the issue is that the plot keeps waffling back and forth between being something really epic and then feeling like Bleach's author is phoning in ideas for them.

I liked the plot for the first game, loved Chain of Memories, was disappointed by how disjointed and random KH2 was, loved 358/2, disappointed with coded, and bothered by the whole Chi=Blade nonsense but otherwise enjoyed Birth by Sleep. 3D has its good parts and I don't mind the group trying to corrupt Sora or Riku taking center stage, but I was bothered by Lea (Axel) getting a Keyblade, the idea that Nobodies can grow new hearts because it completely undermines their existence and the tragedy they bring to the series, and I'm not too thrilled with the time travel paradox that resulted in the New Organization XIII. I just wanted a showdown with Xehanort, not a Boss Rush of him.