As a cho'gath, I've found an excellent tactic that only works if you are low elo and have the gentleman skin. Basically, you spam Shift + 4. This will make Cho laugh. And let me tell you, enemies do not like you laughing at them in a teamfight. So, they will attack you. But that's the point, you want them to attack you because you are the tank. And you might die, but that's the point because your team will wreck while you unload all your CC onto the enemy team.