cry more

useless player wasting time of the others

NEVER run up to an enemy without invisibility and use cover to sneak behind.

abuse invisibility, as in as soon as you see the "detected" marker you press "E". Dont waste Focus meter, but dont forget to use it as thats your only true way of dodging bullets (and apparently parrying them with the sword though i havent tried that). Keep a weapon like a SINGLE shotgun with no attachments (maybe have unfolded stock as well) or akimbo revolvers as you secondary for armored enemies/bosses. You can cheese most of the levels with Minigun + Smart attachment and standing behind cover, like in Crash Site that might be your only way of actually completing it.

i saw a comment from you that you said you beat all trepang2 rage mode with the sword, any tips would you mind sharing ?

i completely agree with you though my teammate was honestly lacking a chromosome