Remi Garde
The Frenchman was effectively handed a hospital pass when he took over from Tim Sherwood at Aston Villa in November 2015 with the club in freefall.
However, Garde did not help himself, banishing a talented player in Jack Grealish to the reserves while also struggling to win over an already fractured squad. He won just two of his 20 games in charge, meaning he left with a win ratio of just 10%.