What is happened with Warwick?

Whenever i play lol in "these times" he constantly geting uber fed early, become unkilable and ganking like rammus with damage of early Xin. I could understand early game junglers like Lee Sin who drop latter, but Warwick seems to have no weakness and to dont drop later in game like Lee. I mean i'm not pro player or so, but i really have a big presure on me when i play jungler against him jungle, not because he kill me, but because he fly from lane to lane and killing everything even if i counter jungle him hard. I just can't see his weakness. So my question is how to counter it or he is so blatantly OP as it seems to me? Thanks.
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