Game-to-game balance issues

What is with the game sometimes deciding ‘screw it Im going to F these players over’ on some missions and yet the next game is a walk in the park

I just played a malice mission with no joke 15 gunners 2 Ogryn gunners, 2 Ogryns with shields and a sniper. There was so many tracers on screen I could barely see anything.

This was right at the very start of a mission, and the two shield Ogryns spawned behind us where we came from. the area covered supposedly by 2 leman russ battle tanks