Overall what FPS do you think revolutionized the genre in terms of AI, action, difficulty, controls, enemies etc. etc.? Personally for me it was a tie between the original Quake and Perfect Dark both of them had a high level of difficulty (Quake so much it hidden the portal to the nightmare difficulty) the AI was brutal and merciless enemies were memoriable (Quake's final boss was a giant marshmellow that threw firballs at you. And Perfect Dark had the dateDyne institute) so what do you think??