EFC
Midfield
Many of their managers have had similar win ratio.
Howard Kendall (1990-93) 60 1.28 37%
Mike Walker (1994) 31 0.87 19%
Joe Royle (1994-97) 97 1.43 37%
Howard Kendall (1997-98) 38 1.05 24%
Walter Smith (1998-2002) 140 1.16 29%
David Moyes (2002-13) 427 1.5 41%
Roberto Martinez (2013-16) 113 1.44 38%
Ronald Koeman (2016-17) 47 1.47 40%
But that win % would have gone drastically down if he had continued. He benefited from having one of the league's top goalscorers at his disposal last season and his failure to replace Lukaku even with a couple of 10-15 goal a season strikers was ridiculous and glaringly obvious that it would make us a far worse team.
He has made mistake after mistake all season.
As @dixonsafc has said above, I still believe we have the quality for a top 10 finish at worst, and by strengthening the striker situation in January would see us have a chance of 7th again. This season we were supposed to be pushing on to challenge those above us and if he had strengthened better then I feel we could possibly have fought it out with Arsenal and Liverpool for 5th/6th.