Dunno how is it 4 u guys but for me Zhao is the best pusher and ganker.
He got amaizing skills that makes him one wicked sick bastard.
Hes not hard to play but difficult to master.

For this dps I Get Armor pentr. Marks and Quinss to do heavy dmg at start , health per lvl Seals to make him abit tanky and magic ressist Glyphs becouse early game Xin Zhao is pretty easy to be killed by a nuker.

As 1st what u should buy is black cleaver and phantom dancer with cleaver unique and criticals u will geat easy kills. After that u just must get trinity as fast as possible its very good thing fro Xin Zhao - with cleaver , trinity and phantom you will have ~2.1 atk spd + big crits chanses that bring enemys pain. (2k+ atk.spd and Xin Zhaos passive wont let u die easly as u think)
For last items u should get infinite edge to do higher dmg with crit's (now tanks will be afraid of u)
Final item is Frozen Mallet - I get him becouse he gives me alot of hp + it has great passive.
NOTE: If 2 or more enemys got madreds bloodrazor then you should buy bloodthirster insted of mallet.

Flash and Ignite are my favorite masterys to DPS's ignite helps deal extra dmg , flash helps to do tricks or escape.
Yet u can pick diffrent one's - combine any between these spells : heal exhoust flash ignite.