Moyes - started right by making a clear statement about who wasnt good enough, but was too loyal to some players and suffered for it. By the end the squad were too institutionalized in his methods and although it got us 7th/8th every year they could have done more.
Martinez - that first season was great, but he made the mistake of thinking it was down to his way of playing rather than a mix of things (taking off the brakes that Moyes had put on them, Rom's impact, a counterattacking style of play). He refused to change his mind and was rightly sacked. Perhaps the most annoying person on this list because if he had instead looked at what worked in the first season we would probably have won something.
Koeman - another one whose ego couldn't make him realise what was directly in front of his face. How he completely ignored that City game and the way we bossed them really did my head in a great deal, as did his treatment of Niasse which was outright bullying.
Allardyce - just crap
Silva - the second half of his first season was great, it was like he figured us out and some of the football (United at home especially) was top drawer. How he went from that to the dog vomit that was the second season was something he will need to explain himself because it made no sense to me. His treatment of Kean was also weird.
Ancelotti - the best manager we've ever had in terms of ability, but was clearly phoning it in for most of his time here with a squad that was nothing like the people he'd played with or managed previously. Even at 10% of his effort he was still miles better than everyone else, mind - that Wolves away game that he won is the greatest managerial performance I've ever seen; to this day I have no idea how he did it.
Benitez - I maintain the only reason he was appointed was because the owner wanted to punish everyone associated with this club. I will never not be convinced that he was deliberately trying to relegate us. The only Everton manager that I have hated.
Lampard - kept us up after Benitez so not entirely negative, but I really do not understand what he was trying to do.
Dyche - kept us up after Lampard so not entirely negative, and has largely sorted out the defence. I also like how he did the right thing with regards to Keane / Branthwaite, which not many of the others above would have done. If he can get someone scoring goals we will be alright.