Core problem with jungle
Look at support items that we got with in patch 3.14.
We got Spellthief's Edge, Ancient Coin and Relic Shield, all 3 of which can be built in greater items (Spellthief's Edge for AP supports, Talisman of Ascension for utility supports and Face of the Mountain for tanky supports).
What Riot did is let supports start with the item that is best suited for them for the laning phase (e.g.: As a Leona you probably want to be tanky from the start and, because you have no sustain or a heal for your ADC, you probably want to pick up that Relic Shield)
And after that supports didn't have to buy Rejuvenation Bead, a couple of wards and done.
But what do we see with junglers? Exactly, everyone is put in the same position, be it
or
. Everyone has to start with Hunter's Machete. I believe that this is the core problem of jungling, the diversity of first item that you can buy.
I believe that junglers should be allowed to choose from different starting items (which will help weaker jungler, a.k.a. tanks).
I don't know if Riot realizes that, but Quill Coat was the best moment tanks have had in jungle in a long time. It gave you enough sustain in jungle and on top of that you had a neat monster damage.
My take at improving the jungle can be found at the top of the thread
The only problem with it is that it would need a complete jungle item upgrade overhaul.
tl;dr: Rito, delete Machete.

jungle again... WANT! The new PBE jungle item is basically a "JungleFire cape" anyway.