Rasmussen ran a poll a few years ago which showed the public had a generally favorable opinion of the postal service. I don't doubt a bit your bad experiences, but as a whole, I'd say most postal employees, particularly the long-term career employees, are generally a decent lot.
http://www.rasmussenreports.com/public_content/lifestyle/general_lifestyle/us_postal_service_gets_favorable_reviews_despite_higher_price_of_stamps
Actually, I can live with whomever delivers my mail. What I cannot abide is the USPS bleeding $42 million a day! Just what do you think one of their competitors would do if faced with the same business situation? It’s just not o.k. to dismiss the problem pointing to the Constitutional requirement for a postal service. FedEx or UPS would do whatever it took to preserve their business. The same should ascribe to the USPS. It’s all about what to do about the workforce, not what needs to be done to become solvent. Let’s face it, the mail volume is declining rapidly. As someone said earlier, “I go to the mailbox and then directly to the garbage can.” The day of the mailed monthly statement is going away. The bulk mail “industry” is going to go away too. What else is there? I now get some monthly magazines on-line and soon there won’t even be any hard copy magazines or newspapers available which is a good thing on many levels including not cutting down trees to print the stuff in the first place.