Nasus is too weak comparing to other Juggernauts
If you take a look at his matchups, he is, by far, the easiest champion to counter in LoL with total of 33 champions who he has <50% win rate against. What's worse is that in those 33 there are several direct subclass rivals
,
,
,
,
against which he has 43.4%, 44.69%, 44.77%, 44,88%, 47,06% win rate respectively. That would have been fine if he, outside of 1v1, offered more utility or AOE dmg to compensate his for 1v1 weakness. However that is not the case, as he is, by far, the most immobile Juggernaut with no relevant CC or AOE dmg, so much so that I don't see a single reason to pick him over any of aforementioned. Riot please pay attention to balancing Juggernauts and having more than just
as a contested meta pick. If you want to have some suggestions on how to do this, please read this.