Jimmah is the worst EX PRESIDENT of the USA and is making Useless Grant look good in comparison!
Grant was a failure as a President....but....his memoirs are considered to be one of the great works of American literature and the greatest war memoir since Caesar wrote his Gallic Wars some 2,000 years earlier, in Latin.
So, in a sense, yes, Grant's retirement was a miserable failure as he was broke and cancer ridden. But...his retirement was also arguably the most successful of any US President in history. History has its ironies, I suppose.
At least Grant did something useful before he became President. In his memoirs he details his military service, but leaves out his Presidency, which is just as well.