Note: crossposting from reddit, because I spent way too long on this to not have a backup. — Honestly, I have had a good number of managers and they all were bad in fairly different ways, but if I have to choose one single complaint, it is sheer incompetence. Incompetent workers shoot themselves on their feet. When it is a manager*, and they make decisions that impact an entire team, metaphorically is like they are shooting themselves on their feet, making a hole in the boat on which the team is, so everybody drowns. Their bad decisions make work frustrating, unproductive, unrewarding, and sometimes plain impossible with respect to some deadlines.