It's true but there's a fine line between a manager who gets the best out of his players and one who gets the results.
Moyes did great at Everton. It wasn't pretty but he certainly got more than the best out of his players, particularly when he got them into the Champions League. At United? Not so much.
Rodgers is earning a good little reputation for himself at Leicester but most chairmen wouldn't touch him with a bargepole after he was sacked by Liverpool.
Things go so fast in football... it's never been harder to see through the hype, the flavour of the month and actual talent. Ranieri, for instance, was never known to overperform with his squads. He was more in the Mourinho mould and yet, he won the big prize with Leicester. Twenty years ago, I had a fairly good idea of who could be a success at which club. It doesn't mean I never got it wrong but I was still able to form an opinion. These days, I might as well toss a coin...