People don't seem to have read the actual article. The main points are:
#1. They tried paying for more protective packaging and it didn't help.
#2. Netflix and Blockbuster using the same service are receiving preferential sorting, and Gamefly has not been able to get the same deal from the USPS.
It doesn't have anything to do with how shitty USPS is or isn't. Besides which, Fedex and UPS aren't any better, and DHL is clearly shittier than all other services.