NOES!!! We like our USPS very much, thank you... er, some of us do. The ones who send mail.
In my experience, things do /not/ get "lost in the mail"-- that's just a slacker's excuse for not having sent something. In this case, stuff's getting /stolen/ in the mail-- different issue, and I'm sure the USPS has federal agents on the case.
Given the size of the US, and that a first class stamp will send your letter across town or from Miami to Honolulu, I consider the USPS (1) a bargain and (2) a poster-child for the idea that government /can/ do things very, very well. Them, and the, um, Flowers By Irene.