Oh lord, here we go again. Well, at the risk of going head to head with the smartest guy in the room, here is an explanation or two.
If you are putting out a game in the same field as a category killer like CoD, you have three options:
1) Pretend they don't exist, go your own merry way with whatever variant of 'realism' you see fit and, usually, go out of business because you can't get enough new players. People with strong opinions on forums do not pay your rent - their purchasing power is not even close to proportional to how loud they are on forums.
2) Try and copy that giant, maybe scrape some sales from people looking for something different, but inevitably fail to make as strong a product due to having a development budget that is a tiny fraction of CoD's.
3) Take the position that there are a lot of gamers out there who would enjoy what it is about your own game that you do, but are stuck following one fairly well-worn gameplay experience. Then work out how to wean them onto your own game - make the transition for them easy, grow your player-base. The hint system we are adding to RO2/RS is a very good example of how that is being done. The aim is to draw general fps players to RO2, not meet them on their own turf.
As an analogy, if you feel that people eat too much processed food, you could try and get them all eating macrobiotic vegan meals overnight, or you could steer their diet away from the things you believe to be bad by making healthy food appealing. The hardcore macrobiotic vegans will prolly get all self-righteous that you did so (in fact, they definitely would - self-righteousness being pretty much a defining feature) but, fact is you would do more good in general than if you tried to insist that people eat only lentil-burgers from day one.
As for talking to people on the forums as if they are idiots, I would say it is more accurate to categorise my responses as those of someone who feels that he is being lectured on his own business by someone who does not know it.
Strictly speaking, I am wasting my time on undergraduate debate here but, I guess I still have enough of the stroppy forum troll in me to rise to the bait occasionally.