What the guys above said - what's truly great about this arc is the anarchy, the unpredictability. The plot might go in so many directions, so many possible events to unfold, there's really no way to tell. And that makes it so exciting. Plus, I have no idea how Togashi makes me like new characters so quickly. They all feel like they have personality, even that random corporal dude. The plot feels alive!
That being said, I hope Hisoka won't interfere too much with the succession war for now - I think that plot is already complex enough as is and should have some ends resolved before adding even more characters.