I don't believe asking if GW was a good POTUS is a good analogy to weigh in on the Post Office. Ask yourself this: 1) If you did not have the Post Office how would you mail a letter? 2) As far as packages go there are a lot of options but the Post Office is the cheapest option for large heavy boxes because UPS and FedEx cherry pick the parcel post market and are geared to be efficient in only a certain profitable segment of the market. Sure, you can ship larger bulkier packages through UPS but you will pay. 3) How many times has a letter you mailed been lost? 4) Have you ever not received a letter or package from post office that you were expecting. 5) How many damaged letters and boxes have you received through the post office. As for asking if GW was a good POTUS well it depends on what time he served. He was considered a great President because he led the Revolutionary War. Would he be a good President today? I don't know. How long has the Post Office been around? A lot longer than GW was President.
Therefore when you want to compare apples & oranges... just talk about fruitcake!
The Post Office is actually one of the better run businesse's by our government. I'd have to say the military would be the best, with the USMC as the apple in the eye.
However, the government's record as a manager of any social service (social security, education, medicare, food stamps, welfare) is dismal! These programs should be managed on a local level, without government regulations, requirements, or restrictions!