Not sure if you're familiar with this but campaign in Homeworld games tend to be horrific, plunging you to the depths of despair every now and then by throwing at you seemingly impossible to carry out tasks, sudden turn of events that astonish you, and just pure enemy cruelty. I must say, the playing experience here is much worse due to the fact that setting your units' stance to "Aggressive" doesn't seem to work at all and you will have to personally order each individual unit or else they will be mere sitting ducks - especially the fighters and corvettes that can be instant gibbed by ramming frigates since they won't even bother to dodge the ramming attack... nor retaliate against fighters and bombers attacking them... until they die or you give the order that is.