It's about destroying your opponent and dismantling his game, down to pieces. There's no room in playing nice. Because when the game is two people, if you're not the winner, you're the loser.
It's about control. Control the tempo of the game, control when your opponent tilts, control yourself so you don't tilt.
It's about aggression. Aggression is a good way to gain control. But over-aggression is a good way to lose control, of yourself. It's about passivity. Being passive while maintaining control is an art, but it's an art worth mastering.
Most importantly, it's about making the table a living hell for the guy sitting across from you and making him regret ever sitting down.