I used to never play Xin as a jungler, frankly because I didn't know how. I have tested many routes and items to jungle with, and now this is the only way I play him. I would have to say that I excel at melee dps over all other types of champs, and Xin is one of the strongest. Hope this guide helps.

Sequence
Q-W-W-E-E-R-E-E-E-W-R-W-W-Q-Q-R-Q-Q
If you prefer burst over sustainability max "Q" before "W".

Priority
Crescent Sweep>< Audacious Charge>< Battle Cry>< Three Talon Strike

Uses
Three Talon Strike
+ knock up
+ burst damage
+ easier to last hit

Battle Cry
+ cooldown reduction
+ attack speed

Audacious Charge
+ slow
+ aoe damage
+ initiation

Crescent Sweep
+ massive aoe damage
+ stat increase

Audacious Charge VS. Three Talon Strike

The main reason people use Xin's "Q" is for the knock up; this can still be achieved with only one rank into this skill. The second reason is the increased burst damage; which is, at max level, 75 additional damage per auto attack for three attacks, totaling to 225 damage.

The main reason people use Xin's "E" is the slow; which the slow percentage is increased by 100% from ranks one through five(20-40%). The second use is initiation; which is self-explanatory.

Going back to burst damage Three Talon Strike= 225 additional damage (physical damage)
Audacious Charge = 230 additional damage (magic damage)

Granted TTS may be able to deliver more damage with your attack damage+armor pen(over three attacks). The AC damage is instant and the improved slow will actually let you get your full combo off plus addional auto attacks. The slow, cooldown, and damage are all improved by ranking AC; only the damage increases by ranking TTS.

Pros

-Great damage(despite the last patch)
-His passive Tireless Warrior grant sustainability in both lane and jungle.
-Aoe slow
-Knock up
-% damage ultimate
-Ultimate also makes him more tanky
-Gap closer with Audacious Charge
-Decent base health pool and movement speed.
-Low cooldowns, with Battle Cry
-Low mana costs

Cons
-No real way of escaping
-No efficient way to farm other then last hitting with auto attacks, ult can be used, but you really shouldn't waste your ult on creeps.
-Focused often, public enemy #1