I finished the game yesterday, even stayed after the end of the credits.
I really like the game. I started a new game + with all my equipment, trying to complete everything at 100%. after the 4th chapter,..saved and quit and decided to finally try the co op.
I joined a host, he was clearly less equipped than me. I mean that my rig was fully upgraded, and had crafted 2 high damage weapons (1 to 3 shots kill) in normal difficulty.
My host hasn't upgraded anything, He's rig was halfway upgraded and his weapon was a plasma cutter mixed with a line gun.
I think I've spent 2 to 3 hours playing with him. He was mute. He barely stopped to pick up ammo, med packs,....or anything at all. I kept going along.
He was rushing to the next destination as quick as possible,...I followed.
While playing, I kept saving him from death and getting hurt as my weapons were 2 or 3 times more powerful that his. It was a walk in a park.
so spoiler ahead:
Warning: Spoiler! (Click to show)
The part where you have to climb, to rock falling over you where you had to stasis to slow the fall and move,....he kept dying lol, after 10 death, I had to grab my headset and tell him what to do. It was like I was speaking to a wall lol. After 15 tries, he followed me and we got through it.
Then the boss fight, the part where you have to lure it to the harpoons,....he kept far and shooting necromorphs from far,..he kept dying over and over again. And finally when I succeed to harpoon it,...I couldn't break it a part because my partner was far away and not shooting the necromorphs away from me, pulling the handle to break the beast. After 20 tries and yelling, yes I yelled at him. He didn't understand lol.
And I saved and quit.
So went back to my new plus game and it picked up right were I was in co op. lol
Good thing you can select your chapters.
It was fun, but I want to try the co op side missions with someone that knows what he's doing.