Anyone got any good tips on how to play Chen?
Get em fancy lightning bat in the small camp if you can, proceed to nuke the shit out of enemy mid.
Zoned out enemy mid with 1 creep constantly harassing him. Also, grab em stun centaur and then level 1 smoke gank anywhere, gg first blood any day.
Try push towers as fast as possible I guess since Chen gets weak, fast and lategame he just doesn't scale for shit. Just like Treant unless you build treant carry.

He's just simply amazing get a fast Mekansm with his ult heal, few pushing creeps and you should really be able to push really hard and really fast, giving your team excellent map control and gold advantage.