Nah its not unhealthy for the game right now, because we don't have the mutations. The passive mutation (that give him scaling) is what make ay 4th broken in china. Without the mutation, he is hard countered by buff removers like 5kc madara/mask man/han. Even a shark kisame greatly neuters his effectiveness without the mutation.

He is not meta without the mutations, so it's still ok for the time being. The people who can access his skill breaks right now can easily kill a normal player much faster and consistently with ninjas like hiruzen or konan.