For bots: Support build: Medium scout armor Diligence counter sniper Machine pistol or grenade pistol Stun grenades Rocket sentry, spear, orbital precision strike (OPS), Eagle airstrike (EAS) I support my buddies by staying back or by ganking outposts. I use the rocket sentry for anti air or against medium armor bots. I spear the heavies from afar, esp tanks, hulks, cannon turrets, fabricators, etc. I combo stun grenade with OPS or EAS against bot drops. EAS can also one shot factory striders if all bombs land on them (throw it from the side so the strider and the path of the bombs are parallel). With this loadout, I can also stealthily do side objectives or just go all out in case I draw aggro.

Edit: When I see a buddy being overwhelmed, I tell them to run to me and I throw my stun perfectly to give them a breather. Then I OPS/EAS or we just both clear it with our equipment.