I recently bought Call of Duty: Modern Warfare 3 and with my most loved classes I end up having a K:D ratio of 2:1 or 3:1 almost every game. But when it comes to playing as a sniper I just get to 1:1 ratios.
I usually play a bit kamikaze style, much running, precise shooting and always surprising the enemy. When trying to play as a sniper (and I really like being a sniper) I end up getting shot half of the time. Even when I try to lay down my kamikaze intentions and look for a good spot I either end up laying somewhere and nobody comes across my way or I am kind of in the middle of a world war. Also the enemies always seem to see me very quickly.
My aiming besides that is actually pretty good by the way.
Is it just my incapability of finding the right spot for hiding? Are there some special things I have to pay attention to?