Been living under a rock, eh? Gameplay-wise, it just feels a lot better to me than MW2, very direct. MW2 feels very disconnected by comparison, like there's a small lag to everything you do, despite very high framerates (C2D E8400, GTX480, 6GB RAM). Think LFS vs. rFactor. I happened to hop on a CS:S server for the first time in years a few weeks ago and was blown away by how much I felt at home and the responsiveness of the controls.
I think the really hardcore guys play CS 1.6, though.
Under the rock perhaps yes .
I started My fps "career" with Wolfenstein ET, played that many years, then moved on to Americas Army and Day of defeat: source, atm i'm doing some action in AA3, never felt comfortable with those "new age MW styled games" so i have absolutely no idea what MW2 is and tbh i do not care either, one of these eyecandys i would love to have though: BFBC2 (since it's the fps where to 173rd Radicals shooters have moved by now)
CS:S is very fast pace and has a very brutal learning curve. Expect to die again and again and again until you get into the pace of the game. Just make sure you watch others play while you are dead to see what they do
When you are logged in to your steam account, click on 'steam' - upper left corner. Then go to settings and there is an option 'change contact email adress' or something like that. There you can change your email.