Other than his first month in charge were we picked up good points, the rest of his tenure was abject. We had a spell from September to December were we won about 1 game. He was fortunate to have a Lukaku scoring goals trying to get his next move and likewise with Barkley.
Generally got his deriere handed to him on a plate by several teams.
I'm no great fan of Koeman, but you're being a bit unfair there. He inherited a pretty weak squad, in which our more talented players were either ageing (Jagielka, Baines, etc) or very inconsistent (Lukaku, Stones, Ross). In the second half of his first season we seemed to be scoring goals for fun at home - 3 V Southampton, four V Hull, six V Bournemouth, 4 V Leicester; so it wasn't ALL bad. His transfer record was a disaster, I grant you, and I agree that his heart was never in it.