One of Gideon‘s sons was Abimelech. It is arguable if Abimelech should be counted as a judge. If so, he would be classified as a failure, for he violently seized power, did not fight for or liberate his people from foreign powers, but instead fought internally, with much loss of life as a result — including his own.
Abimelech was the son of a concubine (or slave). Interestingly, another judge, Jephthah, was a son of the prostitute. Jephthah, however, unlike Abimelech, was a successful judge, who liberated his people, whereas Abimelech killed — or caused the death — of his people.
Both Abimelech and Jephthah had a less than ideal start in life, but what they did with it was opposite from each other. Jephthah became a hero; Abimelech, a tyrant.