What makes Nasus balanced?

Except for a number of champions that you can count on one hand, Nasus completely destroys everything in his wake. Almost every champion has its hard counters so this turns into a non-argument What makes him balanced except the fact he is melee? With an adequate kit, he is almost un-kite-able He has incredible sustain He has infinite scaling He has AoE wave control He has tremendous damage on turrets He has innate armor penetration He has an incredibly powerful slow He is very tanky and builds up the necessary damage from farm alone, making his farm one of the most gold efficient in the whole game Not only that but he currently ramps up pretty fast making so the late game argument falls
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