Carter as a ‘failed’ President:
Jeez, I don’t even know where to start. out-of-control inflation (I’ll give him credit for appointing Paul Volcker, who started the fiscal tightening to control it).
‘Stagflation’. Before Carter, inflation was usually caused by too-fast economic growth or a loosening of the money supply (or both). Carter’s presidency presided over a period when there was high inflation, high interest rates, but no economic growth, partly due to the ‘malaise’ he helped bring about (see below).
Revealing military secrets for political gain - as I recall, Carter blew the lid on at least one successful ‘black’ project in order to claim credit for it.
The Iranian hostage situation. The screwed up rescue mission, due in part to micromanagement from the White House.
Failure to be re-elected. The people thought he was a bad president.
During Carter’s presidency, the Soviet Union became much more agressive in subverting other countries, including the 1979 invasion of Afghanistan. Their increased agression was due in no small part to Carter’s ‘Dove’ rhetoric, which let the Soviets believe they would be unopposed. And they were.
The biggest failing on his part was as a leader. He used to come out and make sad, dire pronouncements about the state of things, and threw the nation into a funk. Later, he made his famous “Malaise” speech to describe a populace that seemed to be lacking in optimism and enthusiasm - and thereby made it worse.
One of the reasons Reagan was elected in a landslide was because he was an incurable optimist, and the people NEEDED an uplifting leader after four years of Carter’s whining. “Malaise” vanished completely on election day. The Iranian Hostages were released on inauguration day. Reagan made his ‘Evil Empire’ speech and threw the Soviets into a tizzy (but the increasing pressure they were putting on the 3rd world stopped immediately).