how do you equate Koeman as one of the best Premier league managers?
do you mean in the Premier league right now? or in the history of the Premier league? or during a set time period?
again, how have you come to that conclusion? What has he won? whats his win loss %?
He has finished 7th, 6th and 7th in his three seasons in the prem. So yes, he is definitely above the average.
I never was his biggest fan, he's not a top manager and considering his age will never be, but some people's jumping from one extreme to another is ridiculous. From "we are his stepping stone to Barcelona" to comparisons with Walter Smith and Unsworth shouts. All that in about 6 weeks.