The first of all, Xin zhao its one of the best jungler, he could gank lvl 2 if you want to, the only thing like you have to do its use 1 point of the skills on the E instead the Q, also if you could have any item of the Middle game on the Early game, you are on the half way to win.
He have 1 bad thing, its to bad farming on the early game, you could get solo blue/red but you'r HP was too low and cannot gank.