This has happened to me in Call of Duty: Modern Warfare 2. If I play team deathmatch or search and destroy (game modes with a lot of players always; like several thousands) I don´t have much problem joining a lobby, but if I try some game mode with diminished population (like capture the flag or sabotage) I hardly ever or never get into a lobby. For example sabotage has an average of only 200 or 150 players online in it, and capture the flag has an average of 40 people, so no matter how long I wait, I won't join. I guess it is because there are few or no players near my zoneand for some reason it wouldn't let me join far or few players. Has it something to do with the NAT type? Can someone help me out here?