Any manager can have 1 good season, it is maintaining it that is the issue.
He took over a decent side, added well to it in the market with Barry, Lukaku and McCarthy and then reaped the rewards with the feel good factor of a new broom sweeping through after a lot of familiarity.
However, once that had gone he was found out for what he actually was, an inept manager with zero idea of how a team might defend and once the players sussed that, the crap hit the fan and the results got steadily worst as time went on.
Very little doubt we would be at the other end of the table if he had stayed.
Glad Koeman has come in and stopped us conceding goals. Once the players feel they have a solid base to work from we might see a lot better going forward from the attackers too.