Rufail says that 'Call of Duty' novices and vets alike often make the mistake of focusing too much on their kill-to-death ratios. "Although this is okay for Team Deathmatch, it won't help your game in any of the other game modes," he says. "Consider your aggression as an investment in your skill level. You'll take a beating early on, but you'll eventually learn how to play with smart aggression, making you the ultimate teammate in objective-based game modes." This means going after enemies hard and fast, but waiting until you have the jump – with higher ground, sight unseen, or while they're caught up in a gunfight with one of your teammates. 'Rambo,' this is not.