Our own stupid fault for not providing him with the means to be successful.
Huh? He had more than a Ronald Koeman should ever have. The only thing we didn't give him was Sammy Lee.
He didn't succeed because he had crap ideas about how to play football* and crap taste in players.
* Defense first, lots of crossing in attack. Sound like anyone? Koeman is basically just Moyes/Allardyce with a stellar playing career to hide behind.