8. Thinking You Know Better Than Everyone Else
Call of Duty can be an extremely infuriating experience for anyone who likes a bit of objective-based play, given that most players - particularly youngsters - seem to be completely oblivious to the fact that there's actually a task to complete. Play Headquarters, Demolition or any other similar mode, and you'll find that while the more astute members of the team will start heading straight towards the objective, the more braindead team members will simply run around like headless chickens, usually getting themselves killed and losing the game. There's nothing more infuriating than a thoroughly inept player being the last living member of the team, and failing to do one simple task. It's enough to make you think you know better than everyone, but of course, this is dangerous in itself, not only creating an elitist mindset as a player, but making you more close-minded and less amenable to the sort of team-work that will actually win you the game.