I want to state my support for the USPS. Chronically underfunded, yet essential for so many communities. FedEx really seems lost, they used to be the gold Standard. I am impressed with UPS, they have really stepped up. Overall, most folks I have dealt with in shipping have been doing their level best, even where there has been failure.
In a previous life, I had a lot of experience in international shipping in support of a globally ranging scientific drill ship.