>>715104176half the time in campaign you find trolling retards who just run full speed until they are forced to wait for teamates by level design or magnum only keks or 'le throw molotov in forced elevator section' that hasnt been funny since 2008 or mexicans.
You will not be in a party of 3 other serious players with high expectations in campaign (especially when you hit a modded 8 player or superCoop server) so don't be so anxious.