Jungle has been screwed over by Riot
Let me make one thing perfectly clear. The new jungle has done NOTHING at all except make the old junglers absolute dog bladder (except Lee, because... it's Lee). Period.
Why do we see Warwick, Fiddlesticks, and Nunu then, even though WW was nerfed pretty hard before the actual pre-season and nerfed AGAIN in 4.21? Because they're legit the only junglers that can gank now. Yeah, a Warwick has more gank pressure than an Elise now because by the time Elise hits level 4 WW should be level 6. How sad. :(
It's not like Warwick was exactly bad before pre-season. Shook said, when asked about pre-season, "only thing that changed about jungle is now junglers have a harder time and Warwick is suddenly viable." I agree to all of that, except the part where Warwick wasn't viable before pre-season. He was viable, just not more than the other junglers (lolking my ranked win/loss with warwick for more info).
I'm mad because I was a godbless Warwick before pre-season, but nerds keep banning him. Plus he's pretty bad after those nerfs, but he's like the only champion (and Lee) that can both farm and gank. Fiddle and Nunu (like other sustain junglers) are pretty bad at ganks and have to wait until teamfights to use their ults which is when they become viable.
I mean really, this is why junglers that aren't Lee or WW just sit at mid all day; they can do literally nothing in their jungle for fear of getting counterjungled or straight up getting executed. Also, Riot is completely disregarding new players here. Without runes or masteries, I have a LOT of difficulty using my "limitless sustain" as a Fiddle or a Nunu. I can't even use WW or Lee because I'd have to recall at level 2. The old jungle was hard enough without runes, but this?
Plus, if I start off the wrong skill at level 1 (for instance, enemy counterjunglers me and I need to max fear to get out) my jungle is over. I need to sit at mid for level 2 or I'm gonna die to gromp. Keep in mind, I can only sustain infinitely as Fiddle and Nunu because I know what I'm doing (ex. know which skills to use when. If you drain first as Fiddle without losing hp first, you can't solo your buff). For newbie junglers, you might as well get executed 5 times then attempt a terrible level 1 gank and die. Btw, when I'm spectating level 5 friends, both the junglers are just downright feeding everywhere and the jungler with the better laner pretty much always ends up winning.
tl;dr version: Make the jungle easier and fix the god awful champions that are jungling instead of changing the entire jungle itself.
and all of them are fine in the new jungle (I love the new jungle). Was just coaching an
player who didn't know that his spiderlings could tank the new jungle for him (and that his W provided sustain). There's a bunch of nitty gritty mechanical stuff like that which helps you stay healthy in the new jungle. Happy to take a look at what you're doing and give some tips.