Yes, but it was also explained that, as unpredictable and random as the ability was, Netero still instinctively had a a habit or two that did allow an eventual opening for someone skilled enough. And the King was completely holding back so as to not kill him.
No one would be able to survive the amount of strikes necessary to notice and actually get used to any (very subtle) habits in Netero's attacks. The king only stood a chance because he couldn't be hurt by the attacks themselves. I doubt anybody else in the series has the ability to take that many hits from an attack of that caliber.
As for this fight, I'm pretty convinced it will end before a conclusion. I feel like there is more to be done with the spiders and Hisoka is definitely going to play a part in the future because of relations with Gon.