Nasus goes against everything that Riot claims they want in a champion.
Over the years Riot has developed a lot of Champions. Over 120 Champions, and while some are stronger or weaker than others Riot has always gone into it with the mindset that the Champions they design are fun for three parties. You, your team, and the enemy team. While Riot has developed most all of their champions with this in mind, I think they totally botched this idea with Nasus.
Let me start out by saying that this is not a Nasus OP thread, Nasus is NOT OP, but he isn't fun. For anyone.
The player: The average Nasus player might argue with "fun is subjective". This is true, what's fun for some might not be fun for others, but there's no argument when saying "I have more fun farming, than I do teamfighting." If this were a true statement from anyone, ARAM wouldn't even be played, and you would see alot more late game scaling champions who do well by getting farm. So rule out the idea that Nasus' laning phase is fun, it's not. You're basically decimated by your opponent unless you happen to have a favorable matchup, in which case the both of you farm hoping that you outscale the other. You get to have fun for 5 minutes when you're in god mode, but you're going to end the game as soon as u reach god mode so wow for 40 minutes you did nothing, so for 5 minutes you get to have fun. It also guarantees that unless your teamates are stomping their lanes, you're going to get flamed. You are, and you deserve it. You're basically hindering your teamates experience just because of your champion. It's rude, and you're having fun at the expense of others.
The Enemy: The enemy is forced to play against a tank, that deals damage despite not building any damage items. Nasus can build all tank and still one shot carries. It's not fun, the counterplay to this is to end the game. You wanna know how difficult it is to end games with waveclear mids being popular and anti-snowball mechanics in place? It's pretty damn hard. You're forced to commit to fights that wouldn't be good for your team, and if you're not absolutely stomping the 5v4, it's impossible to win the game. And if you didnt know there's 2 other lanes, and a jungler that aren't Nasus. If any of them get ahead, they're able to stall long enough for Nasus to get big, guaranteeing a win. This is not to say that instalocking Nasus is a guaranteed win, it's more than possible to stomp 5v4 teamfights, but it isn't fun to have to constantly force teamfights, it takes away from the objective oriented game that league of legends is intended to be, and it makes your team tilt because there is essentially a timer counting down to 0 until you've hit the turn. If you don't participate in sports, the turn is a term used as a turning point when team that's going to lose realizes they're going to lose and there is nothing they can do about it, team morale is shattered and the game is now a loss, solely because Nasus is in it. This is not fun.
The Teamates: These players suffer more than any other party involved in the game. Not only are they forced to play on the backfoot for the entire game, but even after Nasus completes the countdown and becomes a God, they still don't get to have fun. They get to watch Nasus have fun. They still get destroyed for 40 minutes, and yeah they get a win. But i'd rather lose a close game, than win because Nasus came in as a god and destroyed the enemy. It's not fun to watch someone else destroy enemies you've spent 40 minutes trying to beat just because he wasn't playing the game for the last 40 minutes. Seriously, it is no fun for these players, I would venture to say that a lot of players ban Nasus more often so that he isn't picked for their team, rather than that they don't want to face an enemy Nasus, but hey you're killing two birds with one stone.
What I am getting at here is that Riot specifically designs champions so that they are fun, for all three parties... Nasus isn't fun for any party, save 5 minutes for the player. This isn't good champion design and leads to a lot of players simply despising the character altogether and being frustrated in any scenario where he is in the game.
tl;dr Nasus needs a rework, he's not fun for anyone in the game.
