There are SO MANY of them! Every single breach, patrol, and POI had Stalker variations in my difficulty 7 operation last night. I'm so spoiled from fighting Illuminate, I was so overwhelmed.
I think these new bugs do a good job of emphasizing teamplay. With my go to loadout I used to be able to solo pretty much any situation against terminids, now I'd rather have someone to watch my back
Played against them last night and it fucking sucked. They turn invisible and sneak up on you, they easily outrun and surround you, they attack ferociously with no time to stim or dodge, and they swarm in large numbers. Imagine having seven stalkers chasing you at once, and that gives you a decent idea of the hell Fenrir 3 has become. They can have the planet; I'm not going back.
guns with stagger, sentries, and grouping up closely with other players has been kind to me.
I've been dabbling with heavier armor, but it doesnt play well with the other bugs. I've also heard the gas rover does pretty good, havent tried it yet.