Quake 2 is one of the most difficult FPS games to play competitively. I played the game for 10 years, 1998 - 2008. I can tell you're looking at the game from a different perspective (I'm assuming you're referring to its singleplayer), however - its multiplayer component was nothing short of amazing. Game actually takes a huge physical toll on the player due to complex controls (strafe jumps, circle jumps, doublejumps, circle-strafes, occasional rocket / grenade jump), and the movement aspect combined with aim and general awareness made it one of the best games I had honor to play.