While we're on the topic of cripples (looking at you fiora) and nasus (shoutout to hatedaddy)..
It's no doubt that nasus is in a terrible spot.
The once late game powerhouse from season 2 has since withered to become a champion who scales ok into the mid game and then meh towards late game.
He used to be the champion where you conceded the first 20 minutes but then became the unduelable 1v1 God. What happened?
A couple things really. The first and biggest thing that a lot of people for whatever seem to forget (especially the infuriating crowd of people who say "nasus was never a late game champion" who are wrong as hell) is that wither got GUTTED. If you're wondering why nasus was a late game powerhouse in season 2 who suddenly became late game near-worthless post season 3 is because of this particular change:
http://na.leagueoflegends.com/en/news/game-updates/game-updates/patch-36-notes
"With a 95% movement speed and attack speed reduction at max levels, Wither was completely shutting down champions reliant on auto-attacks with no opportunity for counterplay. By reducing the attack speed slow, Nasus is still effective at suppressing champions, but his victims will now have the option to turn and fight.
Wither Attack speed slow amount has been halved"
the cripple on wither was cut in half, that's a HUGE nerf especially because nearly every dueling champion is auto-reliant (and nasus of course, was designed to duel these champions into the ground through relentless farming and becoming a monstrosity who could destroy their main form of damage while dishing out his own 1000+ physical damage Qs every few seconds). Nasus was no longer able to reliably 1v1 ADCs or auto-oriented fighters late game like fiora or jax.
The second thing that happened that I won't explicate too much is power creep. Everything in league is either directly stronger or just more complicated than it was back then when nasus was king of the late game. That being said, one thing that has remained constant in pretty much every dueler, even camille to some extent, is attack speed.
My proposal then is simple. If not entirely, at least partially revert wither nerf. The logic of the buff is sound.
#1 buffing wither maintains a shitty lane phase for nasus (as was meant to be) since he is obligated to max Q and/or E first before wither #2 it buffs his late game when wither becomes an important tool in his kit for singling out champions to beat down in a duel
Maybe 100% conversion of slow to cripple was a little insane even for a champion like nasus who is meant to be the splitpush dueling god. But 50% was too harsh, so maybe we can try 75%?
TL;DR
Partially revert wither nerf in season 3 that killed nasus late game dueling power so he can once again have some claim to the late game, even if not in teamfights (honestly I dont think he should ever shine in teamfights, but he should definitely shine more in late game duels than he does now).