Counter-picks

[Mr. Zhu]

Level 2 Garen does tons of damage.

It isn't difficult to zone away an enemy champ while simultaneously farming.

Farming at tower is disadvantageous, especially in the early levels, when your attack speed is low and your cooldowns are high.

If you're being zoned away from melee-ing the creeps, it is better to farm with Spirit Fire than to idly sit and wait.

Wither costs 80 mana. Every time Nasus has to use wither on Garen, Garen wins.

14% lifesteal when you're only doing 70 damage-per-strike is about 10 health returned. And every time you step forward to do that, you're getting Q and E'd.

Nasus is weak early game.

lol, k.

Edit: Since I don't see a way of settling this, I wouldn't mind playing a custom game with you 1v1 to see if your argument really works.