haha, i was waiting for someone to question that comment. I've written about it before on other boards back when i played more games, but its been a while. That comment has started a lot of arguments in the past, but usually in the end the favor comes out that "in most cases" (not all), the statement is fairly accurate. This is a paste from a couple months ago, thank god i dont have to write it again:
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It has to do with the entire forced-style of gameplay and mechanics between traditional FPS games (from id software, raven, and non-cs valve, etc.) and Counterstrike or CS:S. There could be an entire topic on what i mean by "forced", but basically it just means how the games move and how limiting they are in how you can manipulate your movements.
in this case, Counterstrike is the "limiting" one. All player's movement speed is set to a constant and you cant really become a "faster" player, movement wise, than anyone else. This is the total opposite of Quake-type FPS's where movement itself is always a strategy and a learned/difficult technique. Quake trains players to time the angle of their jumps, their path through the routes to the strategically placed guns, and basically forces you to become aware of every single landmark around you.
In CS, this is *all* cut out. You dont have to worry about your speed around the map as long as you stay on par with the enemy. And you dont have guns to find.. and even if you did, you only have 2 options (+knife) at any given time.
The other factor here is the quickness of death. Counterstrike caters to "lucky" single shots.. headshots... really split-second battles. There is very little time to do anything besides strafe left or right and basically fire your gun at [hopefully] their heads. Some players have become really good and have maxed out the highest combat speed that can be attained with the CS engine. And that matters when comparing, because in Quake/HL2DM/etc., there is "no" maxing out. The combinations of speed and fire are endless, and players each take the same amount of damage to kill, rather than getting a lucky headshot with a long-range gun.
Playing CS enough will make you accustomed to all of these limiting points of the game, and it will lessen your skill when attempting to switch back to a full speed FPS.
Anyway, im probably just rambling, and ive probably played way too many FPS games than what is good for me in the past. And like I said, I love CS..always have.. and I like CS:S as well, and play it sometimes. But i also play the tournament style FPS games and I make sure i look at games like CS realistically, and that is that they are "more fun/arcade style", "less skill-based", even though skill is still involved.