Fair enough with regards to the engine, however, a time when games aren't complex are really for retro gaming or handhelds/mobile phone stuff. Halo for instance especially on the harder settings, shows how much good AI for enemies has really progressed. Half Life has shown how story telling in a FPS has progressed. We only have to look at Thief or Deus Ex, even Oblivion to see how complex the genre for FP games have begun. Doom3 is really a no brainer game.