Lag. Lag in xbox games is very annoying. When your trying to snipe someone in the face before they get you and a lag spike comes through right as you pull the trigger. Then you shoot the ground when you were looking right at this guy. Then your dead because either he shot you or someone lagged through either a wall or your claymores. The dumb thing is that some smart people can control the lag. They take an average light switch and hook it between the router and some other thing and then they can turn it off and on really fast and a huge lag spike will come through and affect everyone accept them. Also when people hack or mod their controllers it gives them unfair advantages and I like everything to be fair or I get pissed off. More then half the people on Call of Duty 4 have modded controllers and only the nerds can actually hack on xbox 360 games.