Turn on Kill Cams in Cod4
As you know, CoD4 is an old game. To keep an old game healthy, only maintain the old guys, is not enough, we also need to protect the newbies, improve their skills to keep them active.
I believe that the Kill-cam is the best way. Newbies could know how they died, and learn how those experts play, instead of being killed again and again, from nowhere, for no reason. The bad feeling will kick them out.
If we set the Kill-cam back, the newbies would improve themselves, and definitely most of them would stay, to keep the game, the server alive, and in the final, some of them would donate.
Hope long life to CoD4 and NN.