To get an idea of this madness, it can help to look at some relevant footage.<p>Speedrun of Dead Simple from Doom 2: <a href="http://www.youtube.com/watch?v=dfijpjvS9Q8&feature=player_detailpage#t=326" rel="nofollow">http://www.youtube.com/watch?v=dfijpjvS9Q8&feature=player_de...</a><p>Quake Done Quick: <a href="http://www.youtube.com/watch?v=VpiNDxssUL0" rel="nofollow">http://www.youtube.com/watch?v=VpiNDxssUL0</a><p>~<p>That sort of manic movement is, I think, what really sets apart the elite FPS players of the Doom, Quake, and UT era (and the games in the same vein) from folks in the CoD/Halo games.<p>Also, the level design is pretty much strictly better, because it mattered a lot more. With regenerating health and lots of ammo/easy pickups, you no longer have to be quite so careful when putting together a level, because you know that if the give the player X seconds of time without suffering everything will be okay.