When you play a game for so long, u get to know the ins and outs. You get to a point where your aim and movement is at such a level that the slightest of changes are noticeable. I remember when it would take me ages just configuring my mouse sensitivity.
Double checking the windows setting, downloading the registry fix to remove acceleration, setting the Sense in the mouse program. Each and every aspect of the game I was tweaked into. I knew where to stand, how to move, how to bunny hop, how to shoot, spray.
All this knowledge has since been wasted and isn't a part of the game..so to unlearn all this which I had fine tuned and masted, it's frustrating!
I absolutley agree on the fact of when your at a high standerd, its very annoying when a new game comes out and everything you learned is wasted....but thats life! Theres a few games i got good at online and it goes to pot when they change it.