Ok. You do not need to sit at the back of the map using your sniper that is limited to 12 bullets a minute as a primary, killing essentially nothing. You are much more effect up close using your primary on normal enemies and using your sniper or heavy on harder to kill enemies. It's nice when people play in such a way that makes the strike go quickly, instead of camping at the back of the map leaving me to kill almost every enemy in the 3 waves.