Why do so many former members criticized Guardiola?

Why mess with players Guardiola particularly? AP Ibrahimovic, Eto'o, Franck Ribery, Fabregas, Yaya - Toure ...... If you want to find a common denominator for these players if: They are criticized and even attacked Guardiola. So the question is, why so many former player Guardiola will do so unhappy? Anyway, you have to admit that so many world-class marshal, but, like Guardiola so often ...