Guess I'll take the other side. I absolutely LOVE the USPS. Since we moved to our current house 26 years ago, I think I've had two packages that went astray. Our mail carrier Brad is a gem, he tracked them down pretty quickly.
I agree that tracking sometimes leaves something to be desired. (In my experience tracking of eBay packages is usually worse, sometimes MUCH worse, regardless of the carrier.) But I never worry much about that, figuring that the package will be here in a week or less. Face it, we OldGuys™ have gotten soft. Remember how you used to order...and wait...and wait...and wait some more, without any idea when the box would get here?
And USPS Enhanced Click-N-Ship is pretty easy to use, with prices about half of Priority mail. I've been able to ship 3' long casting/liner sets without that ridiculous upcharge for long packages. Significantly cheaper than UPS too.