The difference between a good Nasus and a bad Nasus

90% of Nasus's out there are bad Nasus players; they see unlimited scaling and think "I Need Muh stacks" These players will usually take tele but refuse to group. They will use their huge strength to try to split towers and get evermore stacks. And in most games against a competent enemy team, these Nasus's will lose because their team will be 4v5 and the Nasus can't outpush the enemy team.

Good Nasus's understand that their strength comes at a MID-game powerspike, when they are tanky but still deal really good damage. As the game goes on, they are still good, but they are not late game gods. Because late game, ADCs and most mids have ebough damage to tear through them before they can get to the back line. So a good Nasus will look for teles to help his team at any point past 10-12 minutes, when they start to have a decent amount of stacks. And as the game goes on, they will begin to group more and more, only really going solo when their tele is up, so they can tele into a fight. When their tele is down, they group and only try to get stacks by pushing waves/grabbing small monsters from camps. These Nasus players win 80-90% of their games.

Tl-DR Don't be a derpy Nasus. We get that you can scale indefinitely, but your team can only do so much 4v5