All the arcs are very different in general. Fans disappointed with this arc so far are probably annoyed by the exposition, which is more than usual. Also people want more of the Spiders, Hisoka, Ging etc.
You are not supposed to care about all these characters but I don't believe it's possible to be indifferent to all of them. Togashi is challenging himself with all these characters. The pacing has been slow most of the time but Togashi proved that he can change that very easily IMO(the recent mafia clash, Kachou's death). The less capable keep dying and it'll become more interesting. We are all waiting for the moment when everything will explode, that mafia clash will certainly help.
You are not supposed to care about all these characters but I don't believe it's possible to be indifferent to all of them. Togashi is challenging himself with all these characters. The pacing has been slow most of the time but Togashi proved that he can change that very easily IMO(the recent mafia clash, Kachou's death). The less capable keep dying and it'll become more interesting. We are all waiting for the moment when everything will explode, that mafia clash will certainly help.
It's like Togashi is going in so many directions rather than focus on one plot and have the subplots revolve around it.

