I think any of the big three package carriers are amazing. Think of all the mail you get in a day, multiply by 260 million. That's a TON of letters and packages to deliver every day. The logistics behing the entire system is amazing. My letters get delivered in three to four days across the country, and for only 33 cents. Seems like a good deal to me.
The commercials I see on TV are for priority mail, and I'm guessing that's aimed at internet shipping. There's a big fight going on there between the USPS, UPS, and FedEx for that business. Very lucrative stuff. And it's just getting bigger. All three want to dominate.
Yea, the USPS is like a corporation in that it does not recieve any government funding. They're self sufficient.