Jax is ok, I guess. Not as good as he used to be though. The old Jax was my favourite champ of all time.
One of the things laners have to realize is that jungling is not all about ganking, especially with junglers like Shyvana. Whenever I play her I make it explicitly clear to not push too much because she's not very good at ganking. However, I counter-jungle a lot as her, and could pull 30-40 CS ahead of the enemy jungler by mid-game. Keeping their jungler busy, plus clearing wards are still a good part of jungling I think.