I finally understand people who complain about "noone" ruining things.

So I was playing ice king on the 3 atlas mission in Canney valley (it was 4 player difficulty) because the rewards seemed really good. I had spent many resources and the first 10 minutes building defenses on all 3 (with legendary tire traps several tiles up) while the 3 other guys just strut around doing nothing to help me. I finally finish and look around for a few minutes myself before starting the defense. They came and everything was fine till I noticed something. Someone put uncommon and rare ceiling traps (including tire traps) 1 tile high above the ground on every atlas. I had to spent 3 minutes of the defense breaking those because it literally stopped half my traps from doing any damage and just made it harder than it had to be.