Nocturne is amazing jungler and has an amazing gank potential. Also, lets face it hes just plain out awesome! Althought, I am tired of Riot nerfing him in small ways every patch I still have faith in Nocturne.

I use Nocturne as a jungler and this is my normal jungle route; I start at the Blue and head to the wolves making my way to the mini golem camp. After I kill the mini golem camp i often use a potion and head towards Red remember to have smite ready after i slay Red I get ready to gank and look for a lane which is being pushed too far.

REMEMBER! When you are ganking you MUST land your duskbringer and use Unspeakable Horror on your enemy to fear them. When jungling remember to ward areas like Dragon or Baron Nashor for this may be useful for team fights or stealing baron.

Pros
Easy to use
Snowballs
Fast Ganker
Good Farmer
Cons
Squishy Early Game
Paranoia doesnt work if the enemy falls out of range