Camping only happens when the game type forbids it, and there is only one renegade game type, which does NOT forbid it.

Likewise, I have heard people complain about "base ****", which is where you essentially all sit at the entrance of a base shredding anything that comes out, or sit on the enemy spawn locations. The first one is not illegal in any way, and the second one is only unfair(If there's something blocking the spawners, you don't spawn.) and extremely unlikely(as the spawn points are not marked in any way).