Yeah, I think that's kinda been common knowledge.
I'm sort of split on the postal service. They serve a purpose, there are areas in our nation that many private carriers won't deliver to because it's not cost effective. One of them, maybe UPS admits that they use the postal service to relay their packages to spots they won't go to.
In that sense the postal service serves a purpose, but private carriers could do a much more efficient job in the long run. Barriers include overhead - the postal service employs a huge amount of people and services the lions share of the market. It would be nothing for the gubmint to make it impossible for private carriers to break this barrier, they have a virtually unlimited source of funding.
So in a sense you get low quality service for high cost coupled with overpaid workers.
All the shit that's killing us as a nation.