Viable Junglers
Currently the jungle role has the lowest viable pools since S2 (before jungle items). Why is this the case? Well its simple. The XP jungle change.
With the Change to the way XP is gathered in the jungle it makes it so that low gank pressure junglers like Fiddlesticks and the such are completely unplayable. The problem is that since they are reliant on clearing the jungle for 90% of their gold and XP. The XP nerf fucks them. They arent able to really able to keep up with the meta in any way shape or form.
Now for you that dont understand how the jungle xp change has affected junglers. A jungler who clears his jungle only will sit around 1/2 a level above his Bot lane in XP (So about 2 levels below mid and top) until level 11 where he will be 1/2 a level BELOW his bot lane. You cannot get ahead by clearing the jungle anymore.
People are raging on the forums about the fact that 
is in every game. Wanna know why? cause he can actually gank pre 6 and has pressure. In the past if you had a hard farmer and the enemy had a Lee Sin. As long as you didnt just feed the Lee sin your jungler would become much stronger than the lee later. But the problem is because of these XP changes the only viable champions in the jungle are ones that can hard gank over and over and over again. Now you wonder why is this not punished? well this is because there is some INSANE catchup XP in the jungle. If you fall 1 level below your bot lane in the jungle you will get like 1/2 a level from a single camp.
Hard gankers used to lose late game to hard farmers, but with the nerfs to hard farming Jungle The hard gankers no longer have a weakness. They dont get out valued later in the game.
TLDR. remove the fucking XP jungle nerfs.
, and Tank 
.
isnt a problem. The source of the problem is the way that riot has nerfed the jungle. It has made it so that the only actually viable junglers are Hard Ganking Jungelers and Lo and behold all the Hard gankers are either A: 
/ 
or C: 
cause ivern actually just doesnt give a fuck about anything. He builds redemption and throws out daisy. Literally doesnt care if he is 5 levels down cause redemption can still be used if he is dead.
have been eradicated due to the constant nerfs to their style of play. First with the removal of any form of stacking jungle item (I do agree that the items were busted but it did make an interesting dynamic of "can the non Dev jungler get his lanes fed before the other jungler was stacked) and then later nerfs to XP that completely erradicated their styles of play. I was always amazed on how people would constantly say that Farm Junglers were over powered cause they would come out and 1v5..... but then turn around and say that the ADC who sat there and farmed for 30min just like the Jungler and Also just 1v5s is completely fine. (I dont have anything against the whole adc 1v5 when they have 400cs but come on guys.... its no different when a jungler does it)
Junglers when the items dont do anything if you cant gank as well as lee. There are some yes like you have said 
and in my last 30 games I have built