The company makes the job look good to lure you in, then they just push you around. I learned a lot about the way the usps works and enjoyed learning the processes and inner workings of the company. As a PSE, you have zero value other than being a body to do the work. You go where you're needed when you're needed and do whatever they tell you. You're not a person, you're a robot with a pulse. Management tries to do their best, so does the union, but they are always at each other's throats over the most petty things so it seems like nothing really gets accomplished. The roadblocks they've put in each other's way only hinder any progress the company should be doing to keep itself above the competition.
It takes forever to actually get to a career level position. When you start with the company you are not actually a full time person, they start you below the bottom, making $2-3/hr less than careers. They change your schedule/hours weekly and/or daily, the schedule doesn't even come out in enough notice for you to make any sort of life plans (and chances are they're going to change it again). The schedule can be 40 hours this week, and only 28 next week. You MUST comply with management when a senior person decides they don't want to do their job today and you do their work instead. You do not get rewarded for being hard working unless you want to do MORE work.
Simple work, lots of opportunity to look good to management, work with interesting people, great benefits, unionized workforce, opportunities for advancement into management once career status, no customers (for the most part).
Coworkers lack ambition and work ethic, Negative environment, POOR work/life balance