I had a couple of games with Nasus jungle on my side, and they cannot even gank. Turns out its been "buffed" to get more stacks on jungle monsters.
...while the reality is this. 45% winrate with 30% pickrate out of nasus players.
Why would you even pick a jungler who is weak to counter jungling, cannot gank, only strong in a specific powerspike blows my mind. If you wanna do that pick udyr or shyvana.