hi gleeks! today I would like to understand why all the hate towards the last three seasons.

Personally I believe that the last three seasons, especially the fourth, are among the best: the development of the new and old characters, Kurt and Rachel's life at NYADA, the management of the guest star (Kate Hudson, Whoopi Goldberg, Sarah Jessica Parker), Finn Hudson's management of New Directions and the musical Glease. (and def the partial absence of schuester)