Not sure either. Their ganks aren't awful, but definitely below average. The third hit of her E is a pretty good execute.
They probably need to be played with a lot more map awareness for invades and counter ganks than just straight ganking. Having a more coordinated and aggressive team would help too to secure more marks. So you might be more dependent on your teammates early-game, relative to other junglers, but similar to other marksmen.
Idk, i think the answer I'm arriving at is you play passive early, and wait until later in the game. IIRC, in an even game you should be able to do decent damage with just stormrazor warrior.