Camping has always been around. What people do is spam their guns down the other end in the crossroads area (on the original map) and eventually kill the opposition until the opposing team's numbers are significantly lower than the "camping" team. The "camping" team then rushes the opposition in the hope that they may kill off the rest of the team. If successful, which it usually is, the "camping" team wins. This is why its a widely used tactic.