Note: I have played this on Xbox360 so I have way more hours.

I host an expert game on my own on Dark Carnival. 3 randoms join. They were pretty good. Unfortunately 1 had to go but another replaced him so it was fine. Another one left but he was a griefer. TK-ed me while a Tank was alive and killing us. Managed to kick him off but both of my remaining teammates left. They were eventually replaced with another group which was ok. Took us several tries to beat the final level. Finally got to the helicopter but 1 guy decided to kill us all before getting on the heli and escaping. As a result, that entire campaign didn't count toward the all expert campaign achievment.

10/10 Would get backstabbed by randoms again.

Note: I have played this on Xbox360 so I have way more hours. I host an expert game on my own on Dark Carnival. 3 randoms join. They were pretty good. Unfortunately 1 had to go but another replaced him so it was fine. Another one left but he was a griefer. TK-ed me while a Tank was alive and killing us. Managed to kick him off but both of my remaining teammates left. They were eventually replaced with another group which was ok. Took us several tries to beat the final level. Finally got to the helicopter but 1 guy decided to kill us all before getting on the heli and escaping. As a result, that entire campaign didn't count toward the all expert campaign achievment. 10/10 Would get backstabbed by randoms again.