I had the same problem. I came to the conclusion that i'm just not hitting them. Head shot is the way to go, but that is a toughy.

Hey, i've been playing this game since Loren mentioned it and i still don't know how to read the scores. I think the 1st column is kills, and i think the last column is deaths, but i don't know what the other one is.

Also, how do you lie on the ground?