just played my first co-op a few times with random people.... There is a guy named Darth who is a that I got matched up with twice.My first match was with him and he was obviously a griefer, second match was with some guy who was pretty good but I ended up getting a blue screen for some reason, third match was with Darth again (lol), he immediately quit.
My fourth match was with some guy named Zombie Waffles. Me and him where burning through levels but I had to quit (just now) so I could make it to work reasonably on time. Added him as a friend, we worked well together and made it through about 21 puzzles in the last 2 hours.
Co-op is even better than the single player campaign.
*Info*
Darth is a griefer because he cheats and spawns turrets and teleports around the level.... Thats why I call him a griefer, not because he misplaces portals.... He is literally cheating. In the first level of Portal 2 co-op, he spawned like 15 turrets trying to kill me. He never did though, he just disconnected after he realized I was just picking up the turrets and dropping them and hiding around the corners of the start of map 1.

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My first match was with him and he was obviously a griefer, second match was with some guy who was pretty good but I ended up getting a blue screen for some reason, third match was with Darth again (lol), he immediately quit. 
