1. The United States Postal Service Disputed now! [Cons: Long waiting times for the inbound international Registered Airmail and SAL mails to be dispatched domestically, as well as no long-lasting, incomplete, and the misleading “Origin Post is Preparing Shipment” tracking information despite the mail is in transfer (left the origin country)]

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2. Japan Post [日本郵政] Without any dispute! – Highly reliable and fast service, excellent tracking information with all the details

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3. Korea Post [우정사업본부]

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4. Australia Post

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5. Canada Post

Canada Post 2012

6. Deutsche Post (Germany)

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Source: http://blog.syracuse.com/opinion/2013/02/which_country_has_the_worlds_b.html