Yep, the fun is definitely in co-op! I just wanted to see if I could do the daily order mission, but the 120mm Barrage is a piece of shit, I hate it so much. It never hits anything lol
I find most stratagems to be really sub-optimal so if I'm playing serious I'll take the same four but mostly I don't and I pick something random to mess around with. Really, vast majority of stratagems are beaten by a singular one. Railgun is by far the most OP weapon in the game, 500kg bomb is the best AOE, ammo pack solves all your ammo issues forever and rail cannon strike (or whatever it is called) or Eagle rockets take down heavies. Currently this is the strongest loadout you can have and all the top players I played with (lvl 30+) had this setup.
I need better gear to do Extreme properly, something with medium armour penetration would be a blessing.
Thats the railgun currently (or its inferiors like anti-tank rifle and auto cannon).
What we currently need is the Justice from the first game with AP rounds. That killed everything aside the heaviest enemies.