I loved the gameplay and the story kept me entertained until the end. And the way she moved and the way she sucked on her enemies was extremely erotic.
That was an awesome game. It was witty and interesting and unique. It had some great mechanics, like draining an enemy and using them as a shield, or picking up enemy weapons and using them until they were out of bullets. The powers were ahead of their time, too. I definitely consider it a classic.