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I think this is pretty fair - I backed Martinez right until about (February-ish) when it was clear the team had completely tuned him out. I didn't rush to judge then and wont now as we are only about 7 months into Koeman. We all were excited about RM Year 1 at this time. We know how that turned out. I would say though that even a good manager depending on the situation probably needs more than 18 months to know if he is going to be a consistent success with a club. Too many variables - a couple of key injuries depending on club depth can have a huge impact on results and tactics. Not everyone takes those into account because off biases with the hiring in the first place or the emotion of your team losing.
You're not a fan of RK, a perfectly reasonable opinion as those that weren't fans of RM. As far as RK goes I thought he was a safe choice and would bring some credibility as a coach to players, as he was an incredible player and even over the long haul won titles and trophys - even if not as prestigious as the PL or FA cup on more than one occasion. That will get you credibility initially and get the players attention. He could also speak with credibility about what you need to do as an individual to achieve success. You then have to prove the tactical side over time and where great players might prove to not be great managers (re: Gullit). That is where we will need to judge, 2 years from now if he is still here and achieving results. What I do think is undeniable is he doesn't give false praise, the team is playing better, and at this point he has the respect of the players. I hope all these things continue.