Jungle Nunu counters Devourer jungle meta
Man, counterjungling is fun. As a relatively noob player (currently unranked, but want to go into ranked once I can play every role decently), I tried Jungle Nunu, and I must tell you that it's really fun :D. I'm practicing jungle now, and I want to improve, so any tips are welcome!
Pros Amazing jungle sustain Pretty fast clear (very fast against single target) Great scuttle/dragon control Counters devourer junglers (AS slow, counterjungle potential) Good roaming potential
Cons Horrible waveclear (only AoE is ultimate) Not a good duelist Not a good engage tank
I play Nunu as a tanky jungler. I rush sightstone, boots (
if I have enough money), and red trinket, and counterjungle whenever the enemy jungler goes out to gank. I ward enemy jungle, then if I see them on the warded side I go to the other side and counterjungle. I take scuttle crabs often. I take dragons often, usually as soon as it comes up. I get Dead Man's Plate to help with my mobility. Extra damage and slow is nice, too.
My mid-game build usually looks like this.

Situationally, I get the following items.
if they have any meaningful source of magic damage, since the passive is amazing on Nunu with his Q, Consume.
if my team needs an engage. Stats are subpar, though.
if I need to waveclear. I do have Cinderhulk, but this item lets me to go somewhere else and make an impact. The stats are good, too.
if I still need more armor and CDR. This items helps me to solo dragon much more easily.
if I have a fed teammate who can use the AP/Crit chance buff.
To conclude, Nunu jungle is a good jungler to counter Devourer junglers, who need to farm and take scuttle/dragon early.