Now until the end, great mysteris are halfway done and the explanation is meh at best. Already on the Reaper Army Arc if not even before, the author already started to show a burn out, when the Reaper Army arc end the author was already 3/4 out of juice. Many Arcs that had been build up to be that great thing, end up flat, only the "The Abyss arc" showed a little of inspiration, mostly because was something he already thought, but that is, he jumped most of it, and as the use of time skip incress so too did the quality decress. I should say that when great problems and superpower are easy defeated was bad, but then I remember that most of this kind of problem was also solved this way. I think that the Assassin girl with the Bears Soldiers and the Reaper War was the 2 points that I found that had a great dificult, but both of them are also kind easy resolve compared with how dificulty they have looked outside.