http://champion.gg/champion/Warwick/Jungle
From a purely statistical point of view, Warwick is fine. What needs to happen, I think, is a small rework to let that strength be shown more easily. Think about it. He has an ultimate which is a big moment of strength, as it should be, but what else? Aura's typically don't go noticed and the attack speed, while strong, feels pathetic. His MS boost is alright but it is hard to use it trategically (beyond early ganks) to feel as though you've done anything. The Q, again, doesn't feel great to use.
That is my analysis anyway. Numbers wise, Warwick is fine. What about Warwick's kit lets you feel strong? What would you sacrifice in order to get a new mechanic, or how would you change his existing ones to make him feel better?