Though I complain about unnecessary delays, mis-deliveries, and odd all-over-the-country "logistical" routing, I do have to say most of the local PO folks seem to be competent, some very competent, and the delivery people who were habitually causing problems have apparently either been trained to do their jobs right, or relocated.
But poor performance always gets the most attention.
For instance, many seem to forget the hundreds of billions of safe passenger-miles Boeing's aircraft have delivered over many decades.
However, when a product or service that impacts millions of people on a daily basis begins to noticeably deteriorate, it's not unusual for negative reactions to proliferate...especially in these days of the internet as a publicly available soapbox for the airing of grievances, many of them ignorant and uninformed.