I don't hate the postal service, I actually like getting mail delivered and at a reasonable price but it's so unnecessary these days. I can do nearly everything they do electronically except physically get something from one place to another. What I hate is it's just like every other thing the government has its hand in, it's woefully inefficient and overly complicated.
Part of my job is shipping, mostly parcel, and USPS is a pain in the a$$ to use. I can ship UPS with all the bells and whistles; email notifications, delivery receipts etc. in a matter of seconds - and have a daily pickup. What's not to love?