the infinite darkness jutsu completely seals the vision of its victim who riddles in infinite darkness. meaning the sharingan users won't be able to use their eyes to break this genjutsu since their vision is sealed. In order to break it, they will have to find the caster of the jutsu using other means and hit him with a strong jutsu. In Hiruzen's case, he actually had to use the reaper death seal on Hashirama to break from it. Any sharingan/ ms techniques are useless against this gen jutsu technique for that same obvious reason.
The darkness jutsu is quite an op technique and its unique nature makes it one of the best counters against the Uchiha's. This may have helped the shodaime when he defeated Madara.
The darkness jutsu is quite an op technique and its unique nature makes it one of the best counters against the Uchiha's. This may have helped the shodaime when he defeated Madara.