As the worst jungler North America, could we nerf warwick so I can play him again?

Right, but that is 3 items. Previously, before you even hit 6 as weeeeewick, your opponent already put so much pressure on you or your lanes that the game became difficult to win. (Of course this do not count the games where the lanes just win/lose with no jungler interventions). Right now there is more time for ww to charge up his game.

Firstly, there is less junglers that can gank right after first clear, since offensive jungler like kha'zix have no hp left to gank unless they skip a camp, which reduce their jungle efficiency. And if the gank fails, they get no gold no exp. Second, ww dont lose no damn freaking hp at all in the new jungle, while your opponent have a hard time clearing. So the end result is they cannot come into your jungle to mess with a full hp warwick. Thus, more farm time for good old weeeewick.

The new harder to sustain jungle remind me of S1 where weeeewick was the cool kid in town. Where everyone else got beat up by jungle mob, mr weeewick just clear it with full hp XD

And devourer is just broken on him, he get 5 hits on his ult, 40 (the current on hit value on devourer) times 5 that's 200 damage extra, on a lvl 6 ult. Everything melt when you gank something at that point.