going into this match we had one of the best defences this season for goals this season. Considering the shambles he inherited, I think that is at least progress. But with you it is just extremes, there can be no grey area.
Effectively your argument is, Martinez earned the two years because his first 72 point season. You probably would have gone on backing him after last season as you never said when you would have drawn the line.
However, Martinez inherited a team that finished sixth, fourteen points ahead of eighth placed West Brom. Not exactly the worst of foundations.
Koeman inherited a team in freefall, shot of confidence that had finished 11th in the past two seasons.