He didn’t have any success though? Moderate success would have been acceptable I guess but he won nothing between 2004 to 2014. Playing good football is fine if you have end result. Else what is the point? Surely playing good football is acceptable only if you have some sort of an achievement...
You aren’t getting relegated imo. Will probably finish 9th or so which considering your position when Koeman left isn’t the worst. Martinez finished lower iirc?
I think given your situation, he is the best man for the job. In a couple of years, he will take you at least to around 10th, which was more or less where you were under Martinez anyway. So I don’t really see where this takes the club backwards like posts here suggest. He may not be a...