What seperates good BK players and bad BK players is their timing of their bombs. If you see a noob BK missing all his shots, try to pressure him and kill him. But be careful! Many (noob) BK's will panic and use all of their abilities to kill you.
Having trouble using your ultimate? Try to use poppy bomb first and then immediately king bomb (Ultimate), this will make you faster than a max speed maeve, so the enemy wont even bother trying to kill you while you're trying to give them a big hug.
USE YOUR WALL! It blocks fatal attacks, (Terminus ult, skye ult, ruckus ult, willow seed, BK grumpy, etc...) Most healers need line of sight to heal. block vision from a single target with your wall and burst them down before their healer can react
Your ult goes through shields. against a double shield tank on point this makes their longest cd's worthless. It also goes through terminus' absorb shield. Stunning up both tanks on point and blowing their 15 sec cd's is huge.