Syphon Filter. It's the only game I've ever played to match my criteria for the "perfect" game, let alone do it twice. First and foremost, intuitive, fluid gameplay. It played smoothly, but was still intense enough to get your heart pumping. Secondly, good story, in-depth characters, character development, etc. To story was amazing, the characters were relatable, and well developed, and they games left very few plot-holes. Not even plot-holes, just things they should have gone into with greater detail (Lian's capture in Afghanistan and transfer to Aljir Prison). Third, kickass original soundtrack that fits. Syphon Filter has some of the best original music I've ever heard, especially in an action game. The music fits perfectly, and really sets the tone for some of the levels. (The cathedral in SF1 used to scare the shit out of me when I was little just from the music). Lastly, graphics. For me, they mean almost nothing. If the game kicks ass, who gives a shit about the graphics? Nonetheless, the graphics weren't bad, however they weren't great, but they didn't need to be so who cares?