Wombstabber
With the help of this guide I started using the right weapons, the right equipment, and the right perks to get my character from a 1:1 Kill/death ration to a 2:1. This made the game a lot less frustrating and a lot more fun.
Kidrobot
This guide told me where the most foot traffic was for each map which helped me find the enemy faster and rack up my kills to get first place in almost every game I play.
JayPeeezy
I have a 2.8 kill/death ratio and love the perk and kill streak setups that Shanks set up in this book. Before my killstreaks never got the results they do now. When done right I can get 25 kills from only killing five guys in a row, which thanks to this guide is easy to do.
Squintz
My game is so much better it's crazy. I played one on Afghan the other day, and thanks to this guide I now have a high killstreak of 32 kills.