Most employees are young and eager to travel, and they take advantage of that fact. They'll send you somewhere at the blink of an eye and then change their minds half way through your flight around the world so you see you need to turn around and come home the moment you touch down. They'd rather you have four stops with 10 hour layovers than spend a few more dollars on your ticket that would get you to your destination direct. It's fun to travel spontaneously, but when you are trying to do business, maintain a schedule, get shipments through customs, and not let down the people you are trying to lead, it makes it hard to achieve anything without that stability and support from your management. Staff are excited, and they take it because it means they may get to see the world. The frustration is definitely there, though, but people are too exhausted to do much about it.
They also give very, very minimal training. They under advertise the responsibilities of the job, don't give staff adequate training to feel comfortable with these new responsibilities before hitting the road, and then wonder why the staff doesn't perform up to scratch. This isn't the fault of the employees because with actual training and a bit more experience, they might be amazing, but they set the employees up for failure. For those willing to learn, if they ask you what you think you need to work on like most managers at jobs do and you're honest, they hold your comments against you. For the favorites, however, they can't do anything wrong.
Management also is very temperamental, will fire another staff's employee without letting them know, will praise you one day, and decide to let you go the next day without a reason. HR is silent when you need them for help. The support system just isn't there for employees that are running around the world, alone half of the time, trying to manage the safety and happiness of children and successfully represent the business as a responsible entity.
I've had menial or bad jobs before, but this one was the worst of them all because of how you walk in already having drunk the koolaid. Using that naivety against you so they can spend minimal money on your sanity, push you past all limits by keeping you on call from the moment you wake up at the crack of dawn til the moment you go to bed way past midnight since you're working with timezones all over the world, give a brief training for only a minor part of a very complicated job, and then tell you it's your fault you aren't doing well is just depressing.